Attachment 9 - Traffic Impact Analysis
SCHOLARSHIP PREPSCHOOL
DEV2021-00218 TRAFFIC IMPACT ANALYSIS DEV2021-00218 2780 E WAGNER AVENUE, ANAHEIM, CA 92806
Reference Number Agency Date
August 1, 2022
(Revised: May 22, 2023)
City of Anaheim 14736-11 TA Report
PREPARED BY: Robert Vu | rvu@urbanxroads.com
Jose Alire | jalire@urbanxroads.com
Aric Evatt | aevatt@urbanxroads.com
ATTACHMENT NO. 9
Scholarship Prep School Traffic Impact Analysis
14736-11 TA Report REV2
ii
TABLE OF CONTENTS
Table of Contents ............................................................................................................................................... ii
Appendices ......................................................................................................................................................... iv
List of Exhibits ..................................................................................................................................................... v
List of Tables ...................................................................................................................................................... vi
List of Abbreviated Terms ............................................................................................................................... vii
1 Introduction............................................................................................................................................... 1
1.1 Summary of Findings ............................................................................................................................................ 1
1.2 Project Overview ................................................................................................................................................... 3
1.3 Analysis Scenarios ................................................................................................................................................. 3
1.4 Study Area ................................................................................................................................................................ 5
1.5 Deficiencies .............................................................................................................................................................. 7
1.6 Recommendations ................................................................................................................................................ 8
1.7 Queuing Analysis ................................................................................................................................................. 11
2 Methodologies ........................................................................................................................................ 13
2.1 Level of Service .................................................................................................................................................... 13
2.2 Intersection Capacity Analysis........................................................................................................................ 13
2.3 Traffic Signal Warrant Analysis Methodology .......................................................................................... 14
2.4 Multiway Stop Warrant Analysis Methodology ....................................................................................... 15
2.5 Minimum Acceptable Levels of Service (LOS) ......................................................................................... 16
2.6 Deficiency Criteria .............................................................................................................................................. 16
3 Area Conditions ...................................................................................................................................... 19
3.1 Existing Circulation Network .......................................................................................................................... 19
3.2 City of Anaheim General Plan Circulation Element ................................................................................ 19
3.3 City of Orange General Plan Circulation Element .................................................................................. 23
3.4 Transit Service ...................................................................................................................................................... 23
3.5 Bicycle & Pedestrian Facilities ......................................................................................................................... 23
3.6 Existing (2022) Traffic Counts ........................................................................................................................ 23
3.7 Intersection Operations Analysis .................................................................................................................. 31
3.8 Traffic Signal Warrants Analysis .................................................................................................................... 31
3.9 Multiway Stop Warrant Analysis ................................................................................................................... 31
4 Projected Future Traffic ......................................................................................................................... 33
4.1 Project Trip Generation .................................................................................................................................... 33
4.2 Project Trip Distribution ................................................................................................................................... 35
4.3 Modal Split ............................................................................................................................................................. 35
4.4 Project Trip Assignment ................................................................................................................................... 35
4.5 Background Traffic ............................................................................................................................................. 39
Scholarship Prep School Traffic Impact Analysis
14736-11 TA Report REV2
iii
4.6 Cumulative Development Traffic .................................................................................................................. 39
4.7 Near-Term Traffic Conditions ........................................................................................................................ 42
5 EA and EAP (2023) Traffic Conditions .................................................................................................. 43
5.1 Roadway Improvements .................................................................................................................................. 43
5.2 EA (2023) Traffic Volume Forecasts ............................................................................................................ 43
5.3 EAP (2023) Traffic Volume Forecasts ......................................................................................................... 43
5.4 Intersection Operations Analysis .................................................................................................................. 43
5.5 Traffic Signal Warrants Analysis .................................................................................................................... 43
5.6 Multiway Stop Warrant Analysis ................................................................................................................... 46
6 Future (2025) Traffic Conditions ........................................................................................................... 47
6.1 Roadway Improvements .................................................................................................................................. 47
6.2 Future (2025) Without Project Traffic Volume Forecasts ................................................................... 47
6.3 Future (2025) With Project Traffic Volume Forecasts .......................................................................... 47
6.4 Intersection Operations Analysis .................................................................................................................. 47
6.5 Traffic Signal Warrants Analysis .................................................................................................................... 50
6.6 Multiway Stop Warrant Analysis ................................................................................................................... 50
7 Circulation Recommendations ............................................................................................................. 51
7.1 Driveway Ingress/Egress .................................................................................................................................. 51
7.2 Traffic Management Plan ................................................................................................................................. 51
8 References ............................................................................................................................................... 53
Scholarship Prep School Traffic Impact Analysis
14736-11 TA Report REV2
iv
APPENDICES
Appendix 1.1: Traffic Study Scoping Agreement
Appendix 1.2: Site Adjacent Queues
Appendix 3.1: Traffic Counts – May 2022
Appendix 3.2: Existing (2022) Conditions Intersection Operations Analysis Worksheets
Appendix 3.3: Existing (2022) Conditions Traffic Signal Warrant Analysis Worksheets
Appendix 3.4: Existing Collision Data
Appendix 4.1: Trip Generation Assessment
Appendix 5.1: EA (2023) Conditions Intersection Operations Analysis Worksheets
Appendix 5.2: EAP (2023) Conditions Intersection Operations Analysis Worksheets
Appendix 5.3: EA (2023) Conditions Traffic Signal Warrant Analysis Worksheets
Appendix 5.4: EAP (2023) Conditions Traffic Signal Warrant Analysis Worksheets
Appendix 6.1: Future (2025) Without Project Conditions Intersection Operations Analysis Worksheets
Appendix 6.2: Future (2025) With Project Conditions Intersection Operations Analysis Worksheets
Appendix 6.3: Future (2025) Without Project Conditions Traffic Signal Warrant Analysis Worksheets
Appendix 6.4: Future (2025) With Project Conditions Traffic Signal Warrant Analysis Worksheets
Appendix 7.1: Traffic Management Plan
Scholarship Prep School Traffic Impact Analysis
14736-11 TA Report REV2
v
LIST OF EXHIBITS
Exhibit 1-1: Location Map .................................................................................................................................. 2
Exhibit 1-2: Preliminary Site Plan ..................................................................................................................... 4
Exhibit 1-3: Study Area ....................................................................................................................................... 6
Exhibit 1-4: Project Site Access Recommendations ...................................................................................... 9
Exhibit 1-5: Concept Plan................................................................................................................................ 10
Exhibit 3-1: Existing Number of Through Lanes and Intersection Controls ............................................. 20
Exhibit 3-2: City of Anaheim General Plan Circulation Element ................................................................. 22
Exhibit 3-3: City of Orange General Plan Circulation Element ................................................................... 24
Exhibit 3-4: City of Orange General Plan Roadway Cross-Sections ........................................................... 25
Exhibit 3-5: Existing Transit Routes ................................................................................................................ 26
Exhibit 3-6: City of Anaheim Existing and Planned Bicycle Facilties .......................................................... 27
Exhibit 3-7: City of Orange General Plan Bike Network .............................................................................. 28
Exhibit 3-8: Existing Pedestrian Facilities ...................................................................................................... 29
Exhibit 3-9: Existing (2022) Traffic Volumes .................................................................................................. 30
Exhibit 4-1: Project (Outbound) Trip Distribution ........................................................................................ 36
Exhibit 4-2: Project (Inbound) Trip Distribution ........................................................................................... 37
Exhibit 4-3: Project Only Traffic volumes ...................................................................................................... 38
Exhibit 4-4: Cumulative Development Location Map .................................................................................. 40
Exhibit 4-5: Cumulative Only Traffic Volumes .............................................................................................. 41
Exhibit 5-1: EA (2023) Traffic Volumes ........................................................................................................... 44
Exhibit 5-2: EAP (2023) Traffic Volumes ......................................................................................................... 45
Exhibit 6-1: Future (2025) Without Project Traffic Volumes........................................................................ 48
Exhibit 6-2: Future (2025) With Project Traffic Volumes ............................................................................. 49
Scholarship Prep School Traffic Impact Analysis
14736-11 TA Report REV2
vi
LIST OF TABLES
Table 1-1: Intersection Analysis Locations ...................................................................................................... 7
Table 1-2: Summary of LOS ............................................................................................................................... 8
Table 2-1: Signalized Intersection LOS Thresholds for ICU ......................................................................... 14
Table 2-2: Unsignalized Intersection LOS Thresholds ................................................................................. 14
Table 2-3: Traffic Signal Warrant Analysis Locations ................................................................................... 15
Table 2-4: City of Anaheim Threshold of Significance ................................................................................. 17
Table 3-1: Intersection Analysis for Existing (2022) Conditions ................................................................. 32
Table 4-1: Existing Use Trip Generation Summary ...................................................................................... 34
Table 4-2: Project Trip Generation Summary ............................................................................................... 34
Table 4-3: Trip Generation Comparison ........................................................................................................ 35
Table 4-4: Cumulative Development land use Summary ........................................................................... 42
Table 5-1: Intersection Analysis for EA and EAP (2023) Conditions ........................................................... 46
Table 6-1: Intersection Analysis for Future (2025) Conditions ................................................................... 50
Scholarship Prep School Traffic Impact Analysis
14736-11 TA Report REV2
vii
LIST OF ABBREVIATED TERMS
(1) Reference
ADT Average Daily Traffic
CAMUTCD California Manual on Uniform Traffic Control Devices
Caltrans California Department of Transportation
CEQA California Environmental Quality Act
CMP Congestion Management Program
CUP Conditional Use Permit
DIF Development Impact Fee
EA Existing Plus Approved Plus Ambient Growth
EAP Existing Plus Approved Plus Ambient Growth Plus Project
HCM Highway Capacity Manual
ICU Intersection Capacity Utilization
ITE Institute of Transportation Engineers
LOS Level of Service
MUTCD Manual on Uniform Traffic Control Devices
NP No/Without Project
OCTA Orange County Transportation Authority
OPR Office of Planning and Research
PHF Peak Hour Factor
Project Scholarship Prep School
sf Square Feet
SHS State Highway System
SWITRS Statewide Integrated Traffic Records System
TIA Traffic Impact Analysis
WP With Project
v/c Volume to Capacity
VMT Vehicle Miles Traveled
vphgpl Vehicles per Hour Green per Lane
Scholarship Prep School Traffic Impact Analysis
14736-11 TA Report REV2
viii
This page intentionally left blank
Scholarship Prep School Traffic Impact Analysis
14736-11 TA Report REV2
1
1 INTRODUCTION
This report presents the results of the Traffic Impact Analysis (TIA) for Scholarship Prep School
development (“Project”), which is located at 2780 E Wagner Avenue in the City of Anaheim, as shown
on Exhibit 1-1. The purpose of this TA is to evaluate the potential circulation system deficiencies that
may result from the development of the proposed Project, and where necessary recommend
improvements to achieve acceptable operations consistent with the City’s General Plan level of service
goals and policies. This TA has been prepared in accordance with the City of Anaheim’s adopted
Criteria for Preparation of Traffic Impact Studies (2015) and through consultation with City of Anaheim
staff during the scoping process. (1) The Project traffic study scoping agreement is provided in
Appendix 1.1 of this TA, which has been reviewed by the City of Anaheim.
1.1 SUMMARY OF FINDINGS
The Project is to construct the following improvements as design features in conjunction with
development of the site:
• Modify Project driveway to only be right-in/right-out. Project to modify existing striped median along
Wagner Avenue/Rio Vista Street to restrict driveway to right-in/right-out only access.
Additional details and intersection lane geometrics are provided in Section 1.6 Recommendations of
this report.
Scholarship Prep School Traffic Impact Analysis
14736-11 TA Report REV2
2
EXHIBIT 1-1: LOCATION MAP
Scholarship Prep School Traffic Impact Analysis
14736-11 TA Report REV2
3
1.2 PROJECT OVERVIEW
• It is our understanding that the project is to consist of improvements and additions to an existing
building site to allow for the development of a not-for-profit, public charter school charted by the Orange
County Department of Education, pursuant to California Education Code (EC) Section 47601. The public
charter school will host students from transitional kindergarten through eighth grades. The maximum
student enrollment will include a total of 480 students on site.
• As stated in California legislature (EC Section 47605[e][2]), Charter Schools must admit any student
wishing to attend their school. Therefore, Scholarship Prep Public Charter School does not have any
criteria required for admission.
• The proposed staff for the school includes 40 people per shift and will operate from Monday to Friday
6:00 AM – 6:00 PM.
• The remodeling of an existing 8,923 sf 2-story building for 10 classrooms, administration offices, and
restrooms.
• The addition of a new 5,633 sf 2-story building containing 6 classrooms, restrooms, and an elevator to
match the existing 2-story building in height.
• Remodel of an existing 5,439 sf 1-story building with basement for 3 classrooms, restrooms, and a new
lift.
• Parking lot improvements and pick-up/drop off areas.
• For an initial 24-month period, the existing church sanctuary will operate Sundays, with the use of (1)
classroom after 5:00 PM and (1) office during the week, once per week. Religious assembly use of the
site will cease following the 24-month duration.
A preliminary site plan of which the traffic study will be based on is shown on Exhibit 1-2. Vehicle
access will be accommodated along the existing driveway via Wagner Avenue.
In order to develop the traffic characteristics of the proposed project, trip-generation statistics
published in the Institute of Transportation Engineers (ITE) Trip Generation Manual (11th Edition,
2021). (2) The Project is anticipated to generate a net total of 724 two-way trips per day with 465 AM
peak hour trips and 56 PM peak hour trips. The assumptions and methods used to estimate the
Project’s trip generation characteristics are discussed in greater detail in Section 4.1 Project Trip
Generation of this report.
1.3 ANALYSIS SCENARIOS
For the purposes of this traffic study, potential deficiencies to traffic and circulation have been
assessed for each of the following conditions:
• Existing (2022)
• Existing Plus Approved Plus Ambient Growth (EA) (2023)
• Existing Plus Approved Plus Ambient Growth Plus Project (EAP) (2023)
• Future Conditions Without Project (2025)*
• Future Conditions With Project (2025)*
*Note: Religious assembly use of the site will cease following a 24-month lease. In an effort to present
a conservative analysis, the religious assembly use has been assumed to remain for 2025 conditions.
Scholarship Prep School Traffic Impact Analysis
14736-11 TA Report REV2
4
EXHIBIT 1-2: PRELIMINARY SITE PLAN
Scholarship Prep School Traffic Impact Analysis
14736-11 TA Report REV2
5
1.3.1 EXISTING (2022) CONDITIONS
Information for Existing (2022) conditions is disclosed to represent the baseline traffic conditions as
they existed at the time this report was prepared. For a detailed discussion on the existing traffic
counts, see Section 3.5 Existing Traffic Counts.
1.3.2 EA AND EAP (2023) CONDITIONS
The EA and EAP (2023) conditions analysis determines the potential circulation system deficiencies
based on a comparison of the EA and EAP traffic conditions to Existing conditions. The roadway
network is similar to Existing conditions. To account for background traffic growth, traffic associated
with approved cumulative development projects in conjunction with an ambient growth from Existing
(2022) conditions of 1.0% is included for EA and EAP (2023) traffic conditions. A list of cumulative
development projects was compiled from information provided by the City of Anaheim. The EA and
EAP analysis is intended to identify “Opening Year” deficiencies associated with the development of
the proposed Project based on the expected background growth within the study area.
1.3.3 FUTURE (2025) CONDITIONS
The Future (2025) conditions analysis determines the potential circulation system deficiencies based
on a comparison of the Future (2025) traffic conditions to Existing conditions. The roadway network
is similar to Existing conditions. To account for background traffic growth, traffic associated with
approved cumulative development projects in conjunction with an ambient growth from Existing
(2022) conditions of 3.03% is included for Future (2025) traffic conditions. A list of cumulative
development projects was compiled from information provided by the City of Anaheim. The Future
(2025) analysis is intended to identify short-range deficiencies associated with the development of the
proposed Project based on the expected background growth within the study area.
1.4 STUDY AREA
To ensure that this TA satisfies the City of Anaheim’s traffic study requirements, Urban Crossroads,
Inc. prepared a Project traffic study scoping package for review by City of Anaheim staff prior to the
preparation of this report. This agreement provides an outline of the Project study area, trip
generation, trip distribution, and analysis methodology. The agreement provided to the City is
included in Appendix 1.1 of this TA.
The 11 study area intersections shown on Exhibit 1-3 and listed in Table 1-1 were selected for
evaluation in this TA based on consultation with City of Anaheim staff. At a minimum, the study area
includes intersections where the Project is anticipated to contribute 50 or more peak hour trips per
the City’s Guidelines. (1) The “50 peak hour trip” criterion represents a minimum number of trips at
which a typical intersection would have the potential to be affected by a given development proposal.
The 50 peak hour trip criterion is a traffic engineering rule of thumb that is accepted and used
throughout the City for the purposes of estimating a potential area of influence (i.e., study area).
Scholarship Prep School Traffic Impact Analysis
14736-11 TA Report REV2
6
EXHIBIT 1-3: STUDY AREA
Scholarship Prep School Traffic Impact Analysis
14736-11 TA Report REV2
7
Consistent with City of Anaheim’s Criteria for Preparation of Traffic Impact Studies, the study area
limits have been set based upon the following criteria:
• When the AM or PM peak hour trip generation is expected to exceed 100 vehicle trips from the proposed
development.
• Projects on the Congestion Management Program (CMP) Highway System which generate 1,600 Average
Daily Trips (ADT) or adjacent to CMP Highway System which generates 2,400 ADT.
• Projects that will add 51 or more trips during either AM or PM peak hours to any monitored CMP
intersection.
• Any project where variations from the standards and guidelines provided in this manual are being
proposed.
TABLE 1-1: INTERSECTION ANALYSIS LOCATIONS
# Intersection Jurisdiction Signalized?
1 State College Bl. & Lincoln Av. Anaheim Yes
2 Sunkist St. & Lincoln Av. Anaheim Yes
3 Sunkist St. & South St. Anaheim Yes
4 Sunkist St. & Wagner Av. Anaheim Yes
5 Sunkist St. & Ball Rd. Anaheim Yes
6 Marjan St. & Wagner Av. Anaheim No
7 Rio Vista St. & Frontera St. Anaheim No
8 Rio Vista St. & Lincoln Av. Anaheim Yes
9 Rio Vista St. & South St. Anaheim No
10 Rio Vista St./Driveway 1 & Wagner Av. Anaheim No
11 Batavia St. & Lincoln Av. Orange Yes
1.5 DEFICIENCIES
This section provides a summary of deficiencies by analysis scenario. Section 2 Methodologies
provides information on the methodologies used in the analysis and Section 5 EA and EAP (2023) Traffic
Conditions and Section 6 Future (2025) Traffic Conditions include the detailed analysis. A summary of
level of service (LOS) results for all analysis scenarios is presented on Table 1-2.
Scholarship Prep School Traffic Impact Analysis
14736-11 TA Report REV2
8
TABLE 1-2: SUMMARY OF LOS
1.5.1 EXISTING (2022) CONDITIONS
The study area intersections are currently operating at an acceptable LOS during the peak hours.
1.5.2 EA AND EAP (2023) CONDITIONS
The study area intersections are anticipated to continue to operate at an acceptable LOS consistent
with Existing traffic conditions. The addition of Project traffic would not trigger the City of Anaheim’s
significance criteria.
1.5.3 FUTURE (2025) CONDITIONS
The study area intersections are anticipated to continue to operate at an acceptable LOS consistent
with Existing traffic conditions. The addition of Project traffic would not trigger the City of Anaheim’s
significance criteria.
1.6 RECOMMENDATIONS
The following recommendations are based on the minimum improvements needed to accommodate
site access and maintain acceptable peak hour operations for the proposed Project. The site adjacent
recommendations are shown on Exhibit 1-4 for Project Buildout conditions. The concept plan for the
recommendations is shown on Exhibit 1-5. The site adjacent queuing analysis worksheets are
provided in Appendix 1.2.
Scholarship Prep School Traffic Impact Analysis
14736-11 TA Report REV2
9
EXHIBIT 1-4: PROJECT SITE ACCESS RECOMMENDATIONS
Scholarship Prep School Traffic Impact Analysis
14736-11 TA Report REV2
10
EXHIBIT 1-5: CONCEPT PLAN
Scholarship Prep School Traffic Impact Analysis
14736-11 TA Report REV2
11
Recommendation 1 – Rio Vista St./Driveway 1 & Wagner Av. (#10) – The following Project Design
Features are recommended to accommodate site access:
• Modify Project driveway to only be right-in/right-out. Project to modify existing striped median along
Wagner Avenue/Rio Vista Street to restrict driveway to right-in/right-out only access.
On-site traffic signing and striping should be implemented agreeable with the provisions of the
California Manual on Uniform Traffic Control Devices (CA MUTCD) and in conjunction with detailed
construction plans for the Project site.
Sight distance at each project access point should be reviewed with respect to standard Caltrans and
City of Anaheim sight distance standards at the time of preparation of final grading, landscape, and
street improvement plans.
1.7 QUEUING ANALYSIS
The traffic modeling and signal timing optimization software package SimTraffic has been utilized to
assess the queues. SimTraffic is designed to model networks of signalized and unsignalized
intersections, with the primary purpose of checking and fine-tuning signal operations. SimTraffic uses
the input parameters from Synchro to generate random simulations. These random simulations
generated by SimTraffic have been utilized to determine the 95th percentile queue lengths observed
for each applicable turn lane. A SimTraffic simulation has been recorded up to 5 times, during the
weekday AM and weekday PM peak hours, and has been seeded for 15-minute periods with 60-minute
recording intervals. The results of the queuing analysis worksheets for the weekday AM and PM peak
hours are provided in Appendix 1.2 of this report for Future (2025) traffic conditions.
Scholarship Prep School Traffic Impact Analysis
14736-11 TA Report REV2
12
This page intentionally left blank
Scholarship Prep School Traffic Impact Analysis
14736-11 TA Report REV2
13
2 METHODOLOGIES
This section of the report presents the methodologies used to perform the traffic impact analyses
summarized in this report. The methodologies described are consistent with City of Anaheim’s and
City of Orange’s Guidelines. (1) (3)
2.1 LEVEL OF SERVICE
Traffic operations of roadway facilities are described using the term "Level of Service" (LOS). LOS is a
qualitative description of traffic flow based on several factors, such as speed, travel time, delay, and
freedom to maneuver. Six levels are typically defined ranging from LOS A, representing completely
free-flow conditions, to LOS F, representing breakdown in flow resulting in stop-and-go conditions.
LOS E represents operations at or near capacity, an unstable level where vehicles are operating with the
minimum spacing for maintaining uniform flow.
2.2 INTERSECTION CAPACITY ANALYSIS
The definitions of LOS for interrupted traffic flow (flow restrained by the existence of traffic signals
and other traffic control devices) differ slightly depending on the type of traffic control. The LOS is
typically dependent on the quality of traffic flow at the intersections along a roadway. The 6th Edition
Highway Capacity Manual (HCM) methodology expresses the LOS at an intersection in terms of delay
time for the various intersection approaches. (4) The HCM uses different procedures depending on
the type of intersection control. In comparison, the Intersection Capacity Utilization (ICU) methodology
expresses the LOS at a signalized intersection in terms of volume-to-capacity ratio (v/c). (5)
2.2.1 SIGNALIZED INTERSECTIONS
The City of Anaheim and City of Orange requires signalized intersection operations analysis based on
the methodology described in the ICU for signalized intersections and HCM for unsignalized
intersections. (5) (6) ICU LOS operations are based on an intersection’s intersection capacity per the
ICU methodology. Signalized intersections located within the City of Anaheim have been analyzed
using Traffix (Version 8). The ICU methodology is utilized at signalized intersections only. A minimum
clearance interval of 0.05 in association with lane capacities of 1,700 vehicles per hour of green time
for through lanes and turn lanes were assumed for the ICU calculations.
Scholarship Prep School Traffic Impact Analysis
14736-11 TA Report REV2
14
TABLE 2-1: SIGNALIZED INTERSECTION LOS THRESHOLDS FOR ICU
Description ICU Level of
Service 1
Little or no capacity deficiencies. < 0.60 A
Short-term capacity deficiencies. 0.61 – 0.70 B
Average capacity deficiencies. 0.71 – 0.80 C
Long-term capacity deficiencies. 0.81 – 0.90 D
Very high capacity deficiencies. 0.91 – 1.00 E
Extremely high capacity deficiencies, with intersection capacity exceeded. > 1.00 F
1 Source: County of Orange CMP, ICU Methodology
2.2.2 UNSIGNALIZED INTERSECTIONS
The City of Anaheim requires the operations of unsignalized intersections be evaluated using the
methodology described in the HCM. (4) The LOS rating is based on the weighted average control delay
expressed in seconds per vehicle (see Table 2-2). At two-way or side-street stop-controlled
intersections, LOS is calculated for each controlled movement and for the left turn movement from
the major street, as well as for the intersection as a whole. For approaches composed of a single lane,
the delay is computed as the average of all movements in that lane. Delay for the intersection is
reported for the worst individual movement at a two-way stop-controlled intersection. For all-way
stop controlled intersections, LOS is computed for the intersection as a whole (average delay).
TABLE 2-2: UNSIGNALIZED INTERSECTION LOS THRESHOLDS
2.3 TRAFFIC SIGNAL WARRANT ANALYSIS METHODOLOGY
The term "signal warrants" refers to the list of established criteria used by Caltrans and other public
agencies to quantitatively justify or determine the potential need for installation of a traffic signal at
an otherwise unsignalized intersection. This TA uses the signal warrant criteria presented in the latest
edition of the Caltrans California Manual on Uniform Traffic Control Devices (CA MUTCD). (7)
Description Average Control Delay
(Seconds), V/C ≤ 1.0
Level of Service,
V/C ≤ 1.01
Little or no delays.0 to 10.00 A
Short traffic delays.10.01 to 15.00 B
Average traffic delays.15.01 to 25.00 C
Long traffic delays.25.01 to 35.00 D
Very long traffic delays.35.01 to 50.00 E
Extreme traffic delays with intersection capacity exceeded.> 50.00 F
Source: HCM, 6th Edition
1 If V/C is greater than 1.0 then LOS is F per HCM.
Scholarship Prep School Traffic Impact Analysis
14736-11 TA Report REV2
15
The signal warrant criteria for Existing study area intersections are based upon several factors,
including volume of vehicular and pedestrian traffic, frequency of accidents, and location of school
areas. The CA MUTCD indicates that the installation of a traffic signal should be considered if one or
more of the signal warrants are met. (7) Specifically, this TA utilizes the Peak Hour Volume-based
Warrant 3 as the appropriate representative traffic signal warrant analysis for existing traffic
conditions and for all future analysis scenarios for existing unsignalized intersections. Warrant 3 is
appropriate to use for this TA because it provides specialized warrant criteria for intersections with
urban characteristics. For the purposes of this study, the speed limit was the basis for determining
whether Urban or Rural warrants were used for a given intersection. Urban warrants have been used
as posted speed limits on the major roadways with unsignalized intersections are over 40 miles per
hour while urban warrants have been used where speeds are 40 miles per hour or below. Traffic
signal warrant analyses were performed for the following study area intersection shown on Table 2-
3:
TABLE 2-3: TRAFFIC SIGNAL WARRANT ANALYSIS LOCATIONS
The Existing conditions traffic signal warrant analysis is presented in the subsequent section, Section
3 Area Conditions of this report. The traffic signal warrant analyses for future conditions are presented
in Section 5 EA and EAP (2023) Traffic Conditions, and Section 6 Future (2025) Traffic Conditions of this
report. It is important to note that a signal warrant defines the minimum condition under which the
installation of a traffic signal might be warranted. Meeting this threshold condition does not require
that a traffic control signal be installed at a particular location, but rather, that other traffic factors and
conditions be evaluated in order to determine whether the signal is truly justified. It should also be
noted that signal warrants do not necessarily correlate with LOS. An intersection may satisfy a signal
warrant condition and operate at or above acceptable LOS or operate below acceptable LOS and not
meet a signal warrant.
2.4 MULTIWAY STOP WARRANT ANALYSIS METHODOLOGY
Similar to “signal warrants,” “multiway stop warrants” referred to the list of established criteria used
to quantitatively justify or determine the potential need for multiway stop or all-way stop. This TA
uses the multiway stop warrant criteria presented in the latest edition of the CA MUTCD.
Various factors are cited in the CA MUTCD which need to be considered, including:
• Traffic volumes exceed 300 vehicles per hour for any 8 hours.
• Collision history (SWITRS).
• Other factors, including:
o Potential left turn conflicts.
#Intersections Jursidiction
6 Marjan St. & Wagner Av.Anaheim
7 Rio Vista St. & Frontera St.Anaheim
9 Rio Vista St. & South St.Anaheim
10 Rio Vista St./Driveway 1 & Wagner Av.Anaheim
Scholarship Prep School Traffic Impact Analysis
14736-11 TA Report REV2
16
o The need to control vehicle / pedestrian conflicts near locations that generate high pedestrian
volumes.
o Locations where a road user, after stopping, cannot see conflicting traffic and is not able to
negotiate the intersection unless conflicting cross traffic is also required to stop.
The Existing conditions multiway stop warrant analysis is presented in the subsequent section, Section
3 Area Conditions of this report. The multiway stop warrant analyses for future conditions are
presented in Section 5 EA and EAP (2023) Traffic Conditions, and Section 6 Future (2025) Traffic
Conditions of this report. Multiway stop warrant analysis has been conducted on the intersection of
Rio Vista St./Driveway 1 & Wagner Avenue due to the potential of pedestrian conflicts of the land use.
It is important to note that a multiway stop warrant defines the minimum condition under which the
installation of a multiway stop might be warranted. Meeting this threshold condition does not require
that a multiway stop be installed at a particular location, but rather, that other traffic factors and
conditions be evaluated in order to determine whether the stop is truly justified.
2.5 MINIMUM ACCEPTABLE LEVELS OF SERVICE (LOS)
Minimum Acceptable LOS and associated definitions of intersection deficiencies has been obtained
from each of the applicable surrounding jurisdictions.
CITY OF ANAHEIM
Per City's Growth Management Element requirements, a volume/capacity ratio of 0.90 (Level of
Service D) shall be the lowest acceptable Service Level at intersections following implementation of
mitigation measures. Mitigation measures sufficient to bring intersections and roadway segments to
acceptable service levels must be identified. In order to maintain LOS "D "at intersections, arterial
highway links should be maintained at LOS "C" or better.
CITY OF ORANGE
Per the City of Orange’s General Plan Circulation Element and Growth Management Element
requirements, a volume/capacity (V/C) ratio of 0.90 (LOS D) shall be the lowest acceptable Service Level
at intersections following implementation of roadway improvements. Improvements required to
bring intersections and roadway segments to the acceptable service levels must be identified. In order
to maintain LOS D at intersections, arterial highway links should be maintained at LOS C or better. An
intersection will be deemed deficient and require improvements to achieve an acceptable LOS when
the LOS is E or F (Final V/C Ratio>0.90) and the project-related increase in V/C is equal to or greater
than 0.010.
2.6 DEFICIENCY CRITERIA
This section outlines the methodology used in this analysis related to identifying circulation system
deficiencies.
Scholarship Prep School Traffic Impact Analysis
14736-11 TA Report REV2
17
CITY OF ANAHEIM
A transportation impact on an intersection shall be deemed "significant" in accordance with the following
table:
TABLE 2-4: CITY OF ANAHEIM THRESHOLD OF SIGNIFICANCE
Level of Service Final V/C Ratio Project-Related Increase In V/C
C > 0.700-0.800 Equal to or greater than 0.050
D > 0.800-0.900 Equal to or greater than 0.030
E, F > 0.900 Equal to or greater than 0.010
For purposes of this calculation, the "Final V/C Ratio" shall mean the future V/C ratio at an intersection
considering impacts with Project, Ambient Growth and Related Projects but without any proposed
mitigation.
CITY OF ORANGE
An intersection will be deemed deficient and require improvements to achieve an acceptable LOS
when the LOS is E or F (Final V/C Ratio>0.90) and the project-related increase in V/C is equal to or
greater than 0.010.
Scholarship Prep School Traffic Impact Analysis
14736-11 TA Report REV2
18
This page intentionally left blank
Scholarship Prep School Traffic Impact Analysis
14736-11 TA Report REV2
19
3 AREA CONDITIONS
This section provides a summary of the existing circulation network, the City of Anaheim General Plan
Circulation Network, and a review of existing peak hour intersection operations and traffic signal
warrant analyses.
3.1 EXISTING CIRCULATION NETWORK
Pursuant to the scoping agreement with City of Anaheim staff (Appendix 1.1), the study area includes
a total of 11 existing intersections as shown previously on Exhibit 1-3, where the Project is anticipated
to contribute 50 or more peak hour trips. Exhibit 3-1 illustrates the study area intersections located
near the proposed Project and identifies the number of through traffic lanes for existing roadways
and intersection traffic controls.
3.2 CITY OF ANAHEIM GENERAL PLAN CIRCULATION ELEMENT
As noted previously, the Project site is located within the City of Anaheim. Exhibit 3-2 shows the City
of Anaheim General Plan Circulation Element. (8) The roadway classifications and planned (ultimate)
roadway cross-sections of the major roadways within the City of Anaheim in the vicinity of the
proposed Project, as identified on the City’s General Plan Circulation Element, are described
subsequently.
Primary Arterial. Roadways that provide for circulation within the City and to its adjacent
communities. Primary arterials are typically six lane divided facilities with no parking or four lane
divided with left turn pockets and two parking lanes. The typical right-of-way width of a primary
arterial is 106 feet. The following study area roadways within the City of Anaheim are classified as
primary arterials:
• Lincoln Avenue
• State College Boulevard
• Ball Road
Secondary Arterial. Roadways that provide for circulation within the City. Secondary arterial facilities
are four-lane roadways, with two parking lanes, that are undivided. These facilities have a typical right-
of-way width of 90 feet. The following study area roadways within the City of Anaheim are classified
as secondary arterials:
• South Street
• Rio Vista Street
• Wagner Avenue
• Frontera Street
• Sunkist Street
Scholarship Prep School Traffic Impact Analysis
14736-11 TA Report REV2
20
EXHIBIT 3-1: EXISTING NUMBER OF THROUGH LANES AND INTERSECTION CONTROLS
Scholarship Prep School Traffic Impact Analysis
14736-11 TA Report REV2
21
Scholarship Prep School Traffic Impact Analysis
14736-11 TA Report REV2
22
EXHIBIT 3-2: CITY OF ANAHEIM GENERAL PLAN CIRCULATION ELEMENT
Scholarship Prep School Traffic Impact Analysis
14736-11 TA Report REV2
23
3.3 CITY OF ORANGE GENERAL PLAN CIRCULATION ELEMENT
The roadway classifications and planned (ultimate) roadway cross-sections of the major City of Orange
roadways within the study area, as identified on City of Orange General Plan Circulation Element, are
described subsequently. Exhibit 3-3 shows the City of Orange General Plan Circulation Element and
Exhibit 3-4 illustrates the City of Orange General Plan roadway cross-sections.
3.4 TRANSIT SERVICE
The study area is currently served by Orange County Transportation Agency (OCTA) with bus service
along the Sunkist Street via Route 153, Lincoln Avenue via Routes 42 and 153, and Ball Road via Route
46. There is currently a bus stop along Route 153 on Lincoln Avenue at Rio Vista Street. There are
currently no transit routes or stops along Wagner Avenue or Rio Vista Street near the proposed
Project. The transit services are illustrated on Exhibit 3-5. As shown, there are no existing transit routes
that could potentially serve the site. Transit service is reviewed and updated by OCTA periodically to
address ridership, budget, and community demand needs. Changes in land use can affect these
periodic adjustments which may lead to either enhanced or reduced service where appropriate.
3.5 BICYCLE & PEDESTRIAN FACILITIES
Field observations indicate active pedestrian and bicycle activity within the study area. Exhibit 3-6
illustrates the City of Anaheim Existing and Planned Bicycle Facilities, which includes existing Class II
bike lanes along Wagner Avenue and Rio Vista Street near the vicinity of the Project. A Class I bike path
exist east of the Project. The City of Orange’s bike network is shown on Exhibit 3-7. Existing pedestrian
facilities within the study area, which include sidewalks, bus stop locations, and crosswalks are shown
on Exhibit 3-8.
3.6 EXISTING (2022) TRAFFIC COUNTS
The intersection LOS analysis is based on the traffic volumes observed during the peak hour
conditions using traffic count data collected in May 2022 when local schools were in session and
operating on normal bell schedules. The following peak hours were selected for analysis:
• Weekday AM Peak Hour (peak hour between 7:00 AM and 9:00 AM)
• Weekday PM Peak Hour (peak hour between 4:00 PM and 6:00 PM)
There were no observations made in the field that would indicate atypical traffic conditions on the
count dates, such as construction activity or detour routes and nearby schools were in session and
operating on normal schedules. The raw manual peak hour turning movement traffic count data
sheets are included in Appendix 3.1. Existing weekday AM and weekday PM peak hour intersection
volumes are shown on Exhibit 3-9.
Scholarship Prep School Traffic Impact Analysis
14736-11 TA Report REV2
24
EXHIBIT 3-3: CITY OF ORANGE GENERAL PLAN CIRCULATION ELEMENT
Scholarship Prep School Traffic Impact Analysis
14736-11 TA Report REV2
25
EXHIBIT 3-4: CITY OF ORANGE GENERAL PLAN ROADWAY CROSS-SECTIONS
Scholarship Prep School Traffic Impact Analysis
14736-11 TA Report REV2
26
EXHIBIT 3-5: EXISTING TRANSIT ROUTES
Scholarship Prep School Traffic Impact Analysis
14736-11 TA Report REV2
27
EXHIBIT 3-6: CITY OF ANAHEIM EXISTING AND PLANNED BICYCLE FACILTIES
Scholarship Prep School Traffic Impact Analysis
14736-11 TA Report REV2
28
EXHIBIT 3-7: CITY OF ORANGE GENERAL PLAN BIKE NETWORK
Scholarship Prep School Traffic Impact Analysis
14736-11 TA Report REV2
29
EXHIBIT 3-8: EXISTING PEDESTRIAN FACILITIES
Scholarship Prep School Traffic Impact Analysis
14736-11 TA Report REV2
30
EXHIBIT 3-9: EXISTING (2022) TRAFFIC VOLUMES
Scholarship Prep School Traffic Impact Analysis
14736-11 TA Report REV2
31
3.7 INTERSECTION OPERATIONS ANALYSIS
Existing peak hour traffic operations have been evaluated for the study area intersections based on
the analysis methodologies presented in Section 2.2 Intersection Capacity Analysis of this report. The
intersection operations analysis results are summarized on Table 3-1, which indicates that all existing
study area intersections are currently operating at acceptable LOS during the peak hours. The
intersection operations analysis worksheets are included in Appendix 3.2 of this TA.
3.8 TRAFFIC SIGNAL WARRANTS ANALYSIS
Traffic signal warrants for Existing traffic conditions are based on existing peak hour intersection
turning volumes. No unsignalized study area intersections currently warrant a traffic signal for
Existing traffic conditions. Existing conditions traffic signal warrant analysis worksheets are provided
in Appendix 3.3.
3.9 MULTIWAY STOP WARRANT ANALYSIS
The CA MUTCD section 2B.07 “Multiway Stop Application” requires a minimum of 300 vehicles per
hour for any eight hours of the day entering the intersection from the major road and 200 vehicles
per hour for any eight hours of the day entering the intersection from the minor road to justify the
need for a stop sign. The data collected indicates that neither the major street nor the minor street
volumes meet the CA MUTCD volume criteria for Existing conditions (see Exhibit 3-8).
Collision data history was available through the Statewide Integrated Traffic Records System (SWITRS).
Based on the provided records, a total of 4 collisions occurred at the intersection of Rio Vista
St./Driveway 1 & Wagner Avenue within a 5 year period from August 2017 to July 2022. The collision
data is included in Appendix 3.4.
The results of the vehicle count data, pedestrian and bicyclist volumes, and collision history collected
do not currently justify the need to add an all-way stop control at the intersection of Rio Vista
St./Driveway 1 & Wagner Avenue for Existing conditions.
Scholarship Prep School Traffic Impact Analysis
14736-11 TA Report REV2
32
TABLE 3-1: INTERSECTION ANALYSIS FOR EXISTING (2022) CONDITIONS
Scholarship Prep School Traffic Impact Analysis
14736-11 TA Report REV2
33
4 PROJECTED FUTURE TRAFFIC
This section presents the traffic volumes estimated to be generated by the Project, as well as the
Project’s trip assignment onto the study area roadway network. The Project is to consist of:
• The maximum student enrollment will include a total of 480 students on site.
• The remodeling of an existing 8,923 sf 2-story building for 10 classrooms, administration offices,
restroom, and elevator.
• The addition of a new 5,633 sf 2-story building containing 6 classrooms and restrooms to match the
existing 2-story building in height.
• Remodel of an existing 5,439 sf 1-story building with basement for 3 classrooms, restrooms, and a new
lift.
• Parking lot improvements and pick-up/drop off areas.
• The proposed staff for the school includes 40 people per shift and will operate from Monday to Friday
6:00 AM – 6:00 PM.
• For an initial 24-month period, the existing church sanctuary will operate Sundays, with the use of (1)
classroom after 5:00 PM and (1) office during the week, once per week. Religious assembly use of the
site will cease following the 24-month duration.
A preliminary site plan of which the traffic study will be based on is shown on Exhibit 1-2. Vehicle
access will be accommodated along the existing driveway via Wagner Avenue.
The Fall semester of the proposed Project will operate from mid-August to mid-December and the
Spring semester will operate from mid-January to early June. A Summer program will occur only from
the months of June through July and will be limited to 30 students.
4.1 PROJECT TRIP GENERATION
Trip generation represents the amount of traffic which is both attracted to and produced by a
development. Determining traffic generation for a specific project is therefore based upon forecasting
the amount of traffic that is expected to be both attracted to and produced by the specific land uses
being proposed for a given development. In order to develop the traffic characteristics of the
proposed Project, trip-generation statistics published in the Institute of Transportation Engineers (ITE)
Trip Generation Manual (11th Edition, 2021) was used to estimate the trip generation. (2)
A detailed analysis of the trip generation assessment may be found in the Scholarship Prep Public
Schools Trip Generation Assessment (Urban Crossroads, May 2022). Table 4-1 presents a summary
of the existing weekday and weekend vehicle data. The reference data includes a count of each vehicle
entering and exiting the site. The weekend uses appear to generate fewer than 50 peak hour trips.
As such, additional analysis is not required for the temporary weekend use.
Scholarship Prep School Traffic Impact Analysis
14736-11 TA Report REV2
34
TABLE 4-1: EXISTING USE TRIP GENERATION SUMMARY
Table 4-2 presents the weekday trip generation rates obtained from the ITE Trip Generation Manual
(11th Edition, 2021) for the proposed mix of uses. It should be noted that the Charter School (ITE Land
Use Code 536) daily trip generation rates have a small sample size. As shown in Table 4-2, the
proposed Project is anticipated to generate 926 weekday two-way daily trips with 501 AM and 79 PM
peak hour trips.
TABLE 4-2: PROJECT TRIP GENERATION SUMMARY
As shown in Table 4-3, the development of the proposed Project is anticipated to generate 724 more
weekday trip-ends per day with 465 more AM and 56 more PM peak hour trips as compared to the
existing use. For the purposes of a conservative analysis, the full Project trip generation is assumed
at the study area intersections.
Scholarship Prep School Traffic Impact Analysis
14736-11 TA Report REV2
35
TABLE 4-3: TRIP GENERATION COMPARISON
4.2 PROJECT TRIP DISTRIBUTION
The Project trip distribution represents the directional orientation of traffic to and from the Project
site. Trip distribution is the process of identifying the probable destinations, directions or traffic
routes that will be utilized by Project traffic. The potential interaction between the planned land uses
and surrounding regional access routes are considered, to identify the route where the Project traffic
would distribute. Exhibits 4-1 and 4-2 show the Project outbound and inbound passenger car trip
distribution patterns, respectively. The trip distribution reflects home-based trips as the origin and
various destinations (i.e., home, work, shop, etc.) after pickup or drop off times.
4.3 MODAL SPLIT
The potential for Project trips to be reduced by the use of public transit, walking or bicycling have not
been included as part of the Project’s estimated trip generation. Essentially, the Project’s traffic
projections are "conservative" in that these alternative travel modes would reduce the forecasted
traffic volumes.
4.4 PROJECT TRIP ASSIGNMENT
The assignment of traffic from the Project area to the adjoining roadway system is based upon the
Project trip generation, trip distribution, and the arterial highway and local street system
improvements that would be in place by the time of initial occupancy of the Project. Based on the
identified Project traffic generation and trip distribution patterns, the Project only peak hour
intersection turning movement volumes are shown on Exhibit 4-3. It should be noted that the
restriction in Project access will affect existing traffic patterns from the Project site. As such, the traffic
volumes shown in Exhibit 4-3 includes rerouted trips. Vehicles completing a left turn movement to
and from the Project site are removed (i.e., negative Project volumes) and rerouted to the acceptable
movements.
Scholarship Prep School Traffic Impact Analysis
14736-11 TA Report REV2
36
EXHIBIT 4-1: PROJECT (OUTBOUND) TRIP DISTRIBUTION
Scholarship Prep School Traffic Impact Analysis
14736-11 TA Report REV2
37
EXHIBIT 4-2: PROJECT (INBOUND) TRIP DISTRIBUTION
Scholarship Prep School Traffic Impact Analysis
14736-11 TA Report REV2
38
EXHIBIT 4-3: PROJECT ONLY TRAFFIC VOLUMES
Scholarship Prep School Traffic Impact Analysis
14736-11 TA Report REV2
39
4.5 BACKGROUND TRAFFIC
Future year traffic forecasts have been based upon background (ambient) growth at 1% per year,
compounded annually, for 2023 and 2025 conditions. The total ambient growth is 1.0% for 2023 traffic
conditions (compounded growth of 1 percent per year over 1 years or 1.011 year). The total ambient
growth is 3.03% for 2025 traffic conditions (compounded growth of 1 percent per year over 3 years or
1.013 years). The ambient growth factor is intended to approximate regional traffic growth. This ambient
growth rate is added to existing traffic volumes to account for area-wide growth not reflected by
cumulative development projects. Ambient growth has been added to daily and peak hour traffic
volumes on surrounding roadways, in addition to traffic generated by the development of future
projects that have been approved but not yet built and/or for which development applications have
been filed and are under consideration by governing agencies.
4.6 CUMULATIVE DEVELOPMENT TRAFFIC
A cumulative project list was developed for the purposes of this analysis through consultation with
planning and engineering staff from the City of Anaheim and data provided through the City’s Andy’s
Maps. The cumulative project list includes approved City of Anaheim projects that are anticipated to
contribute traffic to the study area intersections.
Where applicable, cumulative projects anticipated to contribute measurable traffic (i.e., 50 or more
peak hour trips) to study area intersections have been manually added to the study area network to
generate near-term forecasts. In other words, this list of cumulative development projects has been
reviewed to determine which projects would likely contribute measurable traffic through the study
area intersections (e.g., those cumulative projects in close proximity to the proposed Project). For the
purposes of this analysis, the cumulative projects that were determined to affect one or more of the
study area intersections are shown on Exhibit 4-4, listed in Table 4-4, and have been considered for
inclusion. Any additional traffic generated by other projects not on the cumulative projects list is likely
accounted for through background ambient growth factors that have been applied to the peak hour
volumes at study area intersections as discussed in Section 4.5 Background Traffic. Cumulative
development projects shown in Exhibit 4-4 and listed in Table 4-4. Cumulative Only peak hour
intersection turning movement volumes are shown on Exhibit 4-5.
Scholarship Prep School Traffic Impact Analysis
14736-11 TA Report REV2
40
EXHIBIT 4-4: CUMULATIVE DEVELOPMENT LOCATION MAP
Scholarship Prep School Traffic Impact Analysis
14736-11 TA Report REV2
41
EXHIBIT 4-5: CUMULATIVE ONLY TRAFFIC VOLUMES
Scholarship Prep School Traffic Impact Analysis
14736-11 TA Report REV2
42
TABLE 4-4: CUMULATIVE DEVELOPMENT LAND USE SUMMARY
4.7 NEAR-TERM TRAFFIC CONDITIONS
The “buildup” approach combines existing traffic counts with a background ambient growth factor to
forecast EA (2023), EAP (2023), and Future (2025) traffic conditions. An ambient growth factor
accounts for background (area-wide) traffic increases that occur over time up to the year 2023 or 2025
from the year 2022. Traffic volumes generated by the Project are then added to assess the near-term
traffic conditions. The 2023/2025 roadway network is similar to the Existing conditions roadway
network. The near-term traffic impact analysis includes the following traffic conditions, with the
various traffic components:
• Existing Plus Approved Plus Ambient Growth (EA) (2023)
o Existing 2022 counts
o Ambient growth traffic (1.0%)
o Approved Cumulative Development traffic
• Existing Plus Approved Plus Ambient Growth Plus Project (EAP) (2023)
o Existing 2022 counts
o Ambient growth traffic (1.0%)
o Approved Cumulative Development traffic
o Project Buildout traffic
• Future Conditions Without Project (2025)
o Existing 2022 counts
o Ambient growth traffic (3.03%)
o Approved Cumulative Development traffic
• Future Conditions With Project (2025)
o Existing 2022 counts
o Ambient growth traffic (3.03%)
o Approved Cumulative Development traffic
o Project Buildout traffic
Scholarship Prep School Traffic Impact Analysis
14736-11 TA Report REV2
43
5 EA AND EAP (2023) TRAFFIC CONDITIONS
This section discusses the traffic forecasts for EA and EAP (2023) conditions and the resulting
intersection operations and traffic signal warrant analyses.
5.1 ROADWAY IMPROVEMENTS
The lane configurations and traffic controls assumed to be in place for EA and EAP (2023) conditions
are consistent with those shown previously on Exhibit 3-1, with the exception of the following:
• Project driveways assumed to be constructed by the Project to provide site access are also assumed to
be in place for EAP conditions only (e.g., intersection and roadway improvements at the Project’s
frontage and driveways). Specifically, the existing median to closed off to vehicles and the Project
driveway is restricted to be right-in/right-out only access.
5.2 EA (2023) TRAFFIC VOLUME FORECASTS
This scenario includes Existing (2022) traffic volumes plus approved cumulative development projects
plus an ambient growth factor of 1.0%. The weekday peak hour volumes which can be expected for
EA (2023) traffic conditions are shown on Exhibit 5-1.
5.3 EAP (2023) TRAFFIC VOLUME FORECASTS
This scenario includes Existing (2022) traffic volumes plus approved cumulative development projects
plus an ambient growth factor of 1.0% and the addition of Project traffic. The weekday peak hour
volumes which can be expected for EAP (2023) traffic conditions are shown on Exhibit 5-2.
5.4 INTERSECTION OPERATIONS ANALYSIS
EA (2023) peak hour traffic operations have been evaluated for the study area intersections based on
the analysis methodologies presented in Section 2 Methodologies of this TA. The intersection analysis
results are summarized on Table 5-1 for EA (2023) traffic conditions, which indicate that the study area
intersections are anticipated to continue to operate at an acceptable LOS consistent with Existing
traffic conditions.
As shown on Table 5-1, the study area intersections are also anticipated to continue to operate at an
acceptable LOS with the addition of Project traffic under EAP (2023) traffic conditions consistent with
Existing and EA (2023) traffic conditions. The addition of Project traffic would not trigger the City of
Anaheim’s significance criteria. The intersection operations analysis worksheets for EA (2023) traffic
conditions are included in Appendix 5.1 of this TA and in Appendix 5.2 for EAP (2023) traffic conditions.
5.5 TRAFFIC SIGNAL WARRANTS ANALYSIS
The traffic signal warrant analysis for EA and EAP (2023) traffic conditions are based on the peak hour
volumes traffic signal warrants. No study area intersections are anticipated to meet traffic signal
warrants for EA and EAP (2023) traffic conditions (see Appendices 5.3 and 5.4).
Scholarship Prep School Traffic Impact Analysis
14736-11 TA Report REV2
44
EXHIBIT 5-1: EA (2023) TRAFFIC VOLUMES
Scholarship Prep School Traffic Impact Analysis
14736-11 TA Report REV2
45
EXHIBIT 5-2: EAP (2023) TRAFFIC VOLUMES
Scholarship Prep School Traffic Impact Analysis
14736-11 TA Report REV2
46
TABLE 5-1: INTERSECTION ANALYSIS FOR EA AND EAP (2023) CONDITIONS
5.6 MULTIWAY STOP WARRANT ANALYSIS
The CA MUTCD section 2B.07 “Multiway Stop Application” requires a minimum of 300 vehicles per
hour for any eight hours of the day entering the intersection from the major road and 200 vehicles
per hour for any eight hours of the day entering the intersection from the minor road to justify the
need for a stop sign. The data collected indicates that neither the major street nor the minor street
volumes meet the CA MUTCD volume criteria for EA and EAP conditions (see Exhibits 5-1 and 5-2).
The results of the vehicle count data, pedestrian and bicyclist volumes, and collision history collected
do not currently justify the need to add an all-way stop control at the intersection of Rio Vista
St./Driveway 1 & Wagner Avenue for EA and EAP conditions.
Scholarship Prep School Traffic Impact Analysis
14736-11 TA Report REV2
47
6 FUTURE (2025) TRAFFIC CONDITIONS
This section discusses the traffic forecasts for Future (2025) conditions and the resulting intersection
operations and traffic signal warrant analyses.
6.1 ROADWAY IMPROVEMENTS
The lane configurations and traffic controls assumed to be in place for Future (2025) conditions are
consistent with those shown previously on Exhibit 3-1, with the exception of the following:
• Project driveways assumed to be constructed by the Project to provide site access are also assumed to
be in place for Future conditions only (e.g., intersection and roadway improvements at the Project’s
frontage and driveways). Specifically, the existing median to closed off to vehicles and the Project
driveway is restricted to be right-in/right-out only access.
6.2 FUTURE (2025) WITHOUT PROJECT TRAFFIC VOLUME FORECASTS
This scenario includes Existing (2022) traffic volumes plus approved cumulative development projects
plus an ambient growth factor of 3.03%. The weekday peak hour volumes which can be expected for
Future (2025) Without Project traffic conditions are shown on Exhibit 5-1.
6.3 FUTURE (2025) WITH PROJECT TRAFFIC VOLUME FORECASTS
This scenario includes Existing (2022) traffic volumes plus approved cumulative development projects
plus an ambient growth factor of 3.03% and the addition of Project traffic. The weekday peak hour
volumes which can be expected for Future (2025) With Project traffic conditions are shown on Exhibit
5-2.
6.4 INTERSECTION OPERATIONS ANALYSIS
Future (2025) Without Project peak hour traffic operations have been evaluated for the study area
intersections based on the analysis methodologies presented in Section 2 Methodologies of this TA.
The intersection analysis results are summarized on Table 6-1 for Future (2025) Without Project traffic
conditions, which indicate that the study area intersections are anticipated to continue to operate at
an acceptable LOS consistent with Existing traffic conditions.
As shown on Table 6-1, the study area intersections are also anticipated to continue to operate at an
acceptable LOS with the addition of Project traffic under Future (2025) With Project traffic conditions
consistent with Existing and Future (2025) Without Project traffic conditions. The addition of Project
traffic would not trigger the City of Anaheim’s significance criteria. The intersection operations
analysis worksheets for Future (2025) Without Project traffic conditions are included in Appendix 6.1
of this TA and in Appendix 6.2 for Future (2025) With Project traffic conditions.
Scholarship Prep School Traffic Impact Analysis
14736-11 TA Report REV2
48
EXHIBIT 6-1: FUTURE (2025) WITHOUT PROJECT TRAFFIC VOLUMES
Scholarship Prep School Traffic Impact Analysis
14736-11 TA Report REV2
49
EXHIBIT 6-2: FUTURE (2025) WITH PROJECT TRAFFIC VOLUMES
Scholarship Prep School Traffic Impact Analysis
14736-11 TA Report REV2
50
TABLE 6-1: INTERSECTION ANALYSIS FOR FUTURE (2025) CONDITIONS
6.5 TRAFFIC SIGNAL WARRANTS ANALYSIS
The traffic signal warrant analysis for Future (2025) traffic conditions are based on the peak hour
volumes traffic signal warrants. No study area intersections are anticipated to meet traffic signal
warrants for Future (2025) Without and With Project traffic conditions (see Appendices 6.3 and 6.4).
6.6 MULTIWAY STOP WARRANT ANALYSIS
The CA MUTCD section 2B.07 “Multiway Stop Application” requires a minimum of 300 vehicles per
hour for any eight hours of the day entering the intersection from the major road and 200 vehicles
per hour for any eight hours of the day entering the intersection from the minor road to justify the
need for a stop sign. The data collected indicates that neither the major street nor the minor street
volumes meet the CA MUTCD volume criteria for Future Without and With Project conditions (see
Exhibits 6-1 and 6-2).
The results of the vehicle count data, pedestrian and bicyclist volumes, and collision history collected
do not currently justify the need to add an all-way stop control at the intersection of Rio Vista
St./Driveway 1 & Wagner Avenue for Future Without and With Project conditions.
Scholarship Prep School Traffic Impact Analysis
14736-11 TA Report REV2
51
7 CIRCULATION RECOMMENDATIONS
This section provides a discussion of various improvement strategies to ensure efficient movement
of Project vehicles.
7.1 DRIVEWAY INGRESS/EGRESS
Due to the location of the Project driveway, several physical constraints have been taken into
consideration for optimal configuration for the Project driveway. The driveway currently exists with
full access. In other words, no movements are restricted for vehicles entering or exiting the site. To
reduce potential impacts to the adjacent neighborhoods, restricting the access to right-in/right-out
only allows for efficient movement of vehicles by limiting potential conflict points.
A right-turn only lane for the Project was also considered for this location. The queuing analysis in
Section 1.7 Queuing Analysis, and LOS analysis in Section 5 EA and EAP (2023) Traffic Conditions and
Section 6 Future (2025) Traffic Conditions indicate that a shared through-right turn lane is sufficient for
acceptable traffic operations. Wagner Avenue and Rio Vista Street are currently posted with 15 mile-
per-hour (MPH) flashing advisory signs near the Project driveway. The right-turn only lane is not
required for vehicles to decelerate into the intersection.
7.2 TRAFFIC MANAGEMENT PLAN
A traffic management plan has been prepared by the applicant for the Project to ensure efficient traffic
operations during drop-off and pick-up periods, and to reduce traffic impacts to the surrounding
community. The Traffic Management Plan addresses parking and on-site circulation for school
personnel, parents, and visitors. The Traffic Management Plan is provided in Appendix 7.1.
Scholarship Prep School Traffic Impact Analysis
14736-11 TA Report REV2
52
This page intentionally left blank
Scholarship Prep School Traffic Impact Analysis
14736-11 TA Report REV2
53
8 REFERENCES
1. City of Anaheim. Criteria for Preparation of Traffic Impact Studies. Anaheim : s.n., 2015.
2. Institute of Transportation Engineers. Trip Generation Manual. 11th Edition. 2021.
3. City of Orange. Traffic Impact Analysis Guidelines for Vehicle Miles Traveled and Level of Service
Assessment. Orange : s.n., July 2020.
4. Transportation Research Board. Highway Capacity Manual (HCM). 6th Edition. s.l. : National
Academy of Sciences, 2016.
5. Husch, David and Albeck, John. Intersection Capacity Utilization: Evaluation Procedures for
Intersections and Interchanges. Albany, California : Trafficware, 2003 Edition. 09742903-0-0.
6. Transportation Research Board. Highway Capacity Manual (HCM). 6th Edition. s.l. : National
Academy of Sciences, 2017.
7. California Department of Transportation. California Manual on Uniform Traffic Control Devices
(CA MUTCD). [book auth.] California Department of Transportation. California Manual on Uniform
Traffic Control Devices (CA MUTCD). 2014, Updated March 30, 2021 (Revision 6).
8. City of Anaheim. General Plan. City of Anaheim : s.n., June 2018.
Scholarship Prep School Traffic Impact Analysis
14736-11 TA Report REV2
54
This page intentionally left blank