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Riverside County
Transportation Department
Traffic Impact Analysis
Preparation Guide
April 2008
Juan C. Perez Date
Director of Transportation
Traffic Impact Analysis -2- April 2008
Preparation Guide
1.0 INTRODUCTION
The Riverside County Transportation Department (“Transportation Department”) requires that the
traffic and circulation impacts of proposed development projects, General Plan Amendments,
and Specific Plans be analyzed. The traffic impacts of proposed developments are to be
analyzed through the preparation of a Traffic Impact Analysis (TIA) prepared in conformance with
Transportation Department requirements. The Traffic Impact Analysis must be prepared, signed
and sealed by a Traffic Engineer or a Civil Engineer registered in the State of California, qualified
to practice traffic engineering (“Engineer”). This Traffic Impact Analysis Preparation Guide
identifies the required format and methodology that is generally required to be utilized in the
study preparation, subject to the review and approval of the Transportation Department.
2.0 PURPOSE
The Traffic Impact Analysis is to be prepared to assess the following:
• Tracts, Plot Plans, Public Use Permits, Conditional Use Permits, etc.: Will the Level
of Service required by the General Plan be maintained at all affected intersections with
the addition of traffic from the proposed project? If not, what mitigation measures will be
necessary in order to provide the required Level of Service? If mitigation measures are
necessary, are they feasible to implement? Will the project deteriorate traffic operations
or safety?
• General Plan Amendments and Specific Plans: Will the ultimate circulation system
planned for the area be able to provide the required Level of Service, even with the
additional traffic impact of the proposed land use changes? If not, what will be required in
order to provide the required Level of Service?
3.0 TRAFFIC IMPACT ANALYSIS EXEMPTIONS
Certain types of projects, because of their size, nature, or location, are exempt from the
requirement of preparing a TIA. The types of projects that are generally exempt from preparing a
TIA are described in Exhibit A.
The Transportation Department, at its discretion, may require that a TIA be prepared for any
development, regardless of size, if there are concerns over safety, operational issues, or if
located in an area heavily impacted by traffic.
Traffic Impact Analysis -3- April 2008
Preparation Guide
4.0 COORDINATION WITH TRANSPORTATION DEPARTMENT
In order to streamline the TIA preparation and review process, the Engineer shall solicit input and
approval for the Transportation Department prior to the preparation and submittal of a draft
document. A TIA “Project Scoping Form”, attached as Exhibit B, shall be prepared by the
Engineer and submitted to the Transportation Department for approval prior to the preparation of
a draft TIA. The Project Scoping Form provides for agreement of the following key points before
initiating the TIA:
• Determination of study area, intersections, and roadway links to be analyzed.
• Project trip generation, distribution, and assignment.
• Use of other approved projects for background traffic, traffic growth assumptions, or
integration with RCIP Model.
• For those projects located within a City’s Sphere of Influence or adjacent to a city, the
Engineer shall also solicit comments on the above from the City staff. The Engineer
shall submit all comments from City staff to the Transportation Department for review
and consideration.
• For projects within one mile of a state highway, or any project that may create a
significant impact on the state highway, the Engineer shall also coordinate with
Caltrans.
5.0 REQUIRED METHODOLOGY
5.1 Intersection Analysis
The Transportation Department requires the use of the Transportation Research Board -
Highway Capacity Manual (HCM), 2000 Update, or most recent release. Unsignalized
intersections are to be analyzed using Chapter 17 of the Highway Capacity Manual. Signalized
intersection Level of Service shall be analyzed using the Operational Method as described in
Chapter 16, Section II. Refer to Exhibit C for default input parameters. For default values not
specifically provided in Exhibit C, the Engineer shall refer the HCM2000 or most recent release.
5.2 ADT Analysis
The Transportation Department may require that analysis of Average Daily Traffic (ADT) be
conducted in certain cases, such as when intersection analyses are not the controlling factor or
for general planning purposes.
6.0 AREA TO BE STUDIED
In general, the minimum area to be studied shall include any intersection of “Collector” or higher
classification street, with “Collector” or higher classification streets, at which the proposed project
will add 50 or more peak hour trips, not exceeding a 5-mile radius from the project site. The
Transportation Department may require deviation from these requirements based on area
conditions.
Traffic Impact Analysis -4- April 2008
Preparation Guide
7.0 ANALYSIS SCENARIOS
7.1 Tracts, Plot Plans, Use Cases, etc.
The TIA shall include the following analysis scenarios:
1) Existing Traffic. Existing traffic will be counted to determine current conditions. This
constitutes the environmental setting for a CEQA analysis at the time that the hearing
body reviews the project. Traffic count data shall be new or recent. In some cases,
data up to one year old may be acceptable with the approval of the Transportation
Department. Any exception to this must be requested prior to approval of the scoping
agreement.
2) Project Completion (existing + ambient + project). Traffic conditions prior to the
time that the proposed development is completed will be estimated by increasing the
existing traffic counts by an appropriate growth rate to be provided by Transportation
Department staff, projected to the year that the project is estimated to be completed.
Traffic generated by the proposed project will then be added, and the impacts on the
circulation system will be analyzed. This will be the basis for determining project-
specific impacts, mitigation, and conditions of approval.
3) Cumulative (existing + ambient + project + cumulative). Traffic generated by
other approved projects in the study area shall be identified and added to the Project
Completion traffic identified in Scenario 2. This may also include projects that are
proposed and in the review process, but not yet fully approved. This scenario will be
analyzed, and a determination made if improvements funded through the TUMF or
other approved funding mechanism (DIF, Road and Bridge Benefit District, etc.) can
accommodate the cumulative traffic at the target Level of Service (LOS) identified in
the General Plan. If the “funded” improvements can provide the target LOS, payment
into the TUMF (or other fee structure) will be considered as cumulative mitigation
through the conditions of approval. Other improvements needed beyond the “funded”
improvements (such as localized improvements to non-TUMF facilities) should be
identified as such.
4) Project Phasing. Traffic conditions at each project phase completion are to be
analyzed using the same approach as for the project completion year, if applicable.
Traffic associated with each previous project phase shall be included in the analyses
of each successive phase of the proposed project.
7.2 Land Use or Circulation General Plan Amendments or Specific Plans
Development proposals that also include a General Plan Amendment, Specific Plan, Zone
Change or other approval that increases traffic beyond what was approved in the General Plan
will also be required to perform a Build-out Analysis to assess long-term impacts. This analysis
will determine if the Circulation Element of the General Plan is adequate to accommodate
projected traffic at the target LOS, or if additional mitigation is necessary. A phasing plan for all
Specific Plans that identifies mitigation for each development phase is required.
Traffic Impact Analysis -5- April 2008
Preparation Guide
8.0 FUTURE TRAFFIC FORECASTS
8.1 Background Traffic for Tracts, Plot Plans, Use Cases and Project Phasing
All projects within the study area that have received approvals for development (approved plot
plans, approved tentative tracts, approved conditional use permits, etc.,) shall be identified, and
their traffic generation included as cumulative traffic in the study. Proposed projects in the study
area that have been submitted to the County for processing, but not yet approved, may also be
included at the discretion of the Transportation Department. The Transportation Department will
also specify an ambient growth rate to be applied to existing volumes to account for other
general traffic growth in and around the study area.
The traffic from the other approved projects shall be added to the existing traffic plus the ambient
growth rate (Analysis Scenario 2) plus the proposed project to determine future projected traffic
at “Opening Year” of the project, or any subsequent phase.
8.2 Build-Out Studies for General Plan Amendments and Specific Plans
Traffic projections for Build-out scenarios shall utilize the RCIP traffic model or other approved
model. The Engineer shall use the model projections as the basis for determining turning-
movement volumes for the required intersection analysis. A manual assignment of the project
traffic added to the Build-out traffic may typically be used to determine total future traffic, as
approved by the Transportation Department.
Certain large-scale Specific Plans and General Plan Amendments have the potential to create
traffic impacts that are significantly greater than the traffic projections used in the RCIP Traffic
Model, and which also affect the modeling assumptions. For these projects, the Transportation
Department may request that the Build-out analysis utilize the RCIP Traffic Model or other model
approved by the Transportation Department to develop more detailed focused model runs in
order to determine the projected Build-out traffic. The following are guidelines of projects
considered to be significant and subject to the revised modeling requirements:
• 1,500 dwelling units or greater
• 25 acres of commercial or greater
• 150 acres of industrial or greater
• any project producing 15,000 daily trips or greater
Traffic Impact Analysis -6- April 2008
Preparation Guide
9.0 CEQA COMPLIANCE AND DOCUMENTATION
The following types of traffic impacts are considered to be “significant” under CEQA:
1) When existing traffic conditions (Analysis Scenario 1) exceed the General Plan
target LOS.
2) When project traffic, when added to existing traffic (Analysis Scenario 2), will
deteriorate the LOS to below the target LOS, and impacts cannot be mitigated
through project conditions of approval.
3) When cumulative traffic (Analysis Scenario 3) exceeds the target LOS, and impacts
cannot be mitigated through the TUMF network (or other funding mechanism),
project conditions of approval, or other implementation mechanisms.
The General Plan allows the Board of Supervisors to approve development projects even in
instances where the target LOS is exceeded, if the project has overriding benefits. Examples
include projects that provide jobs in a local area, projects that provide needed transportation
improvements that otherwise would not be constructed, projects that provide habitat
conservations, projects that implement non-motorized transportation systems, or projects that
provide some unique benefits to the County which outweigh the traffic impacts. These projects
are required to mitigate traffic impacts to the extent that it is economically feasible as determined
by the Board of Supervisors, based on a value engineering analysis. Projects that have a
significant traffic impact and require a finding of overriding benefits may be required to prepare
an Environmental Impact Report. The need to prepare an EIR shall be determined through
consultation between the Transportation Department, Planning Department, and County
Counsel.
10.0 TRAFFIC IMPACT ANALYSIS FORMAT
The format and required elements to be included in the TIA are specified in Exhibit D. Deviations
from this format require the approval of the Transportation Department.
The TIA will generally include the following major components, as shown in more detail in Exhibit
D and described herein:
• Level of Service analysis
• Proposed mitigation measures
• Traffic signal warrant analysis
• On-site circulation analysis
• Identification of safety and operational improvements
Traffic Impact Analysis -7- April 2008
Preparation Guide
In addition to the above, General Plan Amendments and Specific Plans shall include the
following:
• Specific Plan signalization analysis
• General Plan conformance review
• CETAP conformance review
• Identification of regional funding mechanisms
Projects that involve special uses, such as truck-intensive projects or special events, may also
be required to perform additional analysis to determine project impacts.
10. 1 Level of Service Analysis
The Riverside County General Plan has established minimum Level of Service standards for
developments. These minimums may vary according to the area involved. The Traffic Impact
Analysis shall address whether or not the required Levels of Service will be achieved after the
proposed project is constructed. Level of Service calculations shall be included with the TIA for
all intersections studied. For intersections or roadway links not meeting the required Level of
Service, the intersection or roadway link’s Level of Service must be recalculated using the
proposed mitigation measures to verify that the required Level of Service will be achieved. For
sites with heavy truck usage, Passenger Car Equivalents (PCE’s) as approved by the
Transportation Department shall be utilized in the analysis.
The County’s Level of Service standards, as published in the County’s General Plan, Chapter 4,
are included in the attached Exhibit E.
10.2 Proposed Mitigation Measures
All studies that propose increasing the number of travel lanes on a road or intersection as
mitigation measures, either beyond existing conditions or for General Plan conditions beyond
what is planned for that level of roadway shall clearly identify the impacts associated with such a
change. Identification of funding mechanisms available to fund the improvements and exhibits
showing the lane configuration must be provided in the report.
The exhibits illustrating the improvements must be to scale but conceptual in nature (not
engineering drawings). The concept illustrations must depict, in addition to existing and required
right-of-way, any physical barriers that might preclude making the needed improvements.
Barriers that may preclude making the improvements, such barriers as railroads, major drainage
structures, power lines, and others must be identified. Any other features that might render the
improvements infeasible must also be identified. The objective is to ensure that when Conditions
of Approval are written, there will be every expectation that the required improvements will, in
fact, be made.
Concept illustrations, as described above, shall be prepared for the following instances:
• All improvements, whether on-site or off-site, necessary to mitigate impacts under
Existing plus Ambient Growth, plus Project conditions
• All improvements abutting the proposed project and that are necessary to mitigate
impacts under Existing plus Ambient Growth, plus Cumulative Projects, plus Project
conditions
Traffic Impact Analysis -8- April 2008
Preparation Guide
• All improvements where the required improvements exceed the number of lanes, under
any traffic scenario, that would typically be developed at full implementation of roadways
per the General Plan and the standards for the applicable roadway classification.
In all cases the feasibility of the proposed improvements must be demonstrated and the
availability of right-of-way must be ascertained. Acquisition of additional right-of-way, if
necessary, is the responsibility of the project proponent. If additional right-of-way must be
acquired, either adjacent to the project or off-site, the project proponent must follow the
procedures described in Ordinance 460, Section 3.2.J.
10.3 Traffic Signal Warrant Analysis
The Engineer shall review intersections within the study area, including the project access points,
to determine if signal warrants are met for any of the study year scenarios (existing, opening year
with and without project, etc.) The signal warrant analysis shall utilize the Caltrans peak-hour
warrants for existing intersections and the Caltrans daily warrant for new intersections. The
warrant analysis worksheets shall be included in the study appendices.
If the traffic study states that “a traffic signal is warranted” (or “a traffic signal appears to be
warranted,” or similar statement) at an existing unsignalized intersection under existing
conditions, 8-hour approach traffic volume information must be submitted in addition to the peak
hourly turning movement counts for that intersection. This information will enable the County to
assess whether or not a traffic signal should be installed at the intersection.
10.4 On-site Circulation
The TIA shall examine the proposed on-site circulation for the project and address its adequacy.
This includes identifying the desired level of traffic control at project driveways and/or
intersections.
10.5 Safety and Operational Analysis
The TIA shall examine existing roadway conditions to determine if safety and/or operational
improvements are necessary due to increase in traffic from the project or cumulative projects.
The types of improvements to be identified may include, but are not limited to:
• Need for turning lanes
• Intersections needing future sight distance studies
• Parking restrictions
• Measures to reduce cut-through project traffic in adjacent residential areas
• Potential impacts to adjacent schools
• Queue lengths and impacts to adjacent intersections
• Need for signal interconnect systems
10.6 Specific Plan Signalization Analysis
For traffic signals that are found to be warranted within or bordering a Specific Plan, the TIA shall
identify, after consultation with the Transportation Department, which of these signals are the
responsibility of development within the Specific Plan and which are covered under the County-
wide Signal Mitigation Program.
Traffic Impact Analysis -9- April 2008
Preparation Guide
10.7 General Plan Conformance
The TIA shall identify if the roadway system proposed in the Circulation Element of the General
Plan is adequate to accommodate traffic from the project, or if changes to the General Plan are
proposed as part of the project approval.
10.8 CETAP Conformance
Riverside County, in conjunction with the Riverside County Transportation Commission, is
evaluating various major transportation corridors as part of the Community and Environmental
Transportation Acceptability Process (CETAP). The TIA shall identify if a project is located
adjacent to a potential CETAP corridor. The traffic study preparer shall contract RCTC to
determine if the project is impacted by a potential CETAP corridor.
10.9 Regional Funding Mechanisms
Identify if the project is located within an existing Road and Bridge Benefit District (RBBD),
Assessment District, or identified in another regional funding mechanism.
10.10 Special Uses
• Truck Intensive Uses (Conditional Use Permits, Surface Mining Permits, etc.)
In addition to the standard TIA requirements, or if the standard TIA requirements are
waived, projects that are “truck intensive” (distribution centers, surface mining permits,
etc.,) may be required to submit a study addressing the truck access routes, adequacy of
the existing streets to be used (in terms of geometry and structural section), safety issues
relating to the truck traffic, and the impacts of the truck traffic on existing residences or
businesses.
The County does not use any trip generation rates for truck intensive uses other than ITE.
• Special Event Uses
Special event land uses that do not exhibit typical trip generation characteristics may
require unique analysis, including weekend and off-peak scenarios. Examples of such
uses would be sports stadiums, racetracks or uses that exhibit substantial traffic peaking
associated with special events that are scheduled on a periodic basis. The traffic analysis
for such uses shall include a traffic management plan to control traffic impacts associated
with the special events. Adequate circulation shall be provided to the site and all impacts
shall be alleviated to the maximum extent possible.
11.0 SUBMITTAL REQUIREMENTS AND PROCEDURE
a) A project scoping form must be submitted for approval prior to preparation of the
traffic study. Identification of a Planning case number must be included in order to
process the agreement. A Traffic Study Submittal Form, shown as Exhibit G, shall be
completed and submitted prior to or simultaneously with the scoping agreement
along with the required initial fee of $1,277.04. Based on recent experience, the
County has found it necessary to request funds, in addition to $1,277.04, in amounts
depending on the complexity of the project. This often results in delays in the Traffic
Impact Study report. To avoid such delays, the applicant is advised to contact
Traffic Impact Analysis -10- April 2008
Preparation Guide
Transportation Department staff to get an estimate of the anticipated fee. To avoid
potential delays during the review process, the applicant may prefer to pay a larger
fee initially than the required amount.
The project scoping form must indicate whether or not the project is part of a Specific
Plan (SP) and, if part of an SP, must provide a listing of other approved and active
projects within the SP, and whether or not an SP amendment is proposed.
The scoping form must also show the land use designation per the County General
Plan and the proposed land use designation. The scoping form provides space to
show this information.
b) Upon approval of the scoping agreement and completion of the traffic study report,
submit two bound copies of the Traffic Impact Study report to the Transportation
Department. Clearly identify the project case number on the cover of the report.
Copies of the approved scoping agreement and cumulative projects list as provided
by the County shall be included with the copies of the traffic impact study.
c) If revisions to the Traffic Impact Study are necessary, re-submit two (2) complete
bound copies along with a copy of the comments provided by the Transportation
Department.
Traffic Impact Analysis
Preparation Guide
Exhibits
A. Traffic Impact Analysis Exemptions
B. Scoping Agreement for Traffic Impact Analysis
C. Signalized Intersection Analysis Input Parameters
D. Traffic Impact Analysis Format
E. Level of Service Standards (from General Plan)
F. Traffic Impact Analysis Submittal Form
G. Transportation Consultants
Traffic Impact Analysis -12- April 2008
Preparation Guide
EXHIBIT A
TRAFFIC IMPACT ANALYSIS
EXEMPTIONS
The following types of development proposals are generally exempt from Traffic Impact Analysis
requirements per Board of Supervisor’s action November 5, 1996 (Item No. 3.27.):
1. All Residential Parcel Maps.
2. Single Family Residential Tracts of less than 100 lots.
3. Apartments and other Multiple Family projects of less than 150 units.
4. Plot Plan and Uses Cases for projects of one acre or less.
5. Preschools, Elementary Schools and Middle Schools.
6. Churches, Lodges, Community Centers, Neighborhood Parks and Community Parks.
7. Mini Storage Yards
8. Congregate Care Facilities that contain significant special services, such as medical
facilities, dining facilities, recreation facilities and support retail facilities.
9. Level 1
projects (100-200 peak hour trips) in areas where a comprehensive traffic analysis
has been performed and road improvement infrastructure funding mechanisms are in
place. The Transportation Department may, however, require a traffic impact analysis
study for projects that exhibit potential adverse impacts to the circulation system.
10. Any use which can demonstrate, based on the most recent edition of the Trip Generation
Report published by the Institute of Transportation Engineers (ITE) or other approved trip
generation data, trip generation of less than 100 vehicle trips during the peak hours.
These exemptions will apply in most cases, however, the Transportation Department reserves
the right to require a traffic impact analysis for any development regardless of size and/or type.
The level of analysis shall be determined on an individual basis. The following are examples of
conditions under which an exemption would not be granted.
a. The presence of an existing or potential safety problem.
J
uan C. Pere
z
Director of Transportation
Traffic Impact Analysis -13- April 2008
Preparation Guide
Exhibit A continued
b. The location of the development in an environmentally or otherwise sensitive
area, or in an area that is likely to generate public controversy.
c. The presence of a nearby substandard intersection or street. This is normally
considered to be an existing Level of Service “D” or worse, or substandard
improvements.
d. The need for a focused study for access/operational issues.
e. A request from an affected agency, such as Caltrans or an adjacent city, which is
deemed by the Transportation Department to be reasonable and rational.
Traffic Impact Analysis -14- April 2008
Preparation Guide
Exhibit B
SCOPING AGREEMENT FOR TRAFFIC IMPACT STUDY
This letter acknowledges the Riverside County Transportation Department requirements for traffic
impact analysis of the following project. The analysis must follow the Riverside County Transportation
Department Traffic Study Guidelines dated February 2005.
Case No. (i.e. TR, PM, CUP, PP)
Related Cases -
SP No.
Provide SP No. and list of other approved or active projects within the SP.
EIR No.
GPA No.
CZ No.
Project Name:
Project Address:
Project Description:
Consultant
Developer
Name:
Address:
Telephone:
Fax:
A. Trip Generation Source: (ITE 7
th
Edition or other)
Current GP
Land Use
Provide General Plan Land
Use Designation (e.g.: MDR,
CR, etc)
Proposed Land Use
Current Zoning Proposed Zoning
Current Trip Generation Proposed Trip Generation
In Out Total In Out Total
AM Trips
PM Trips
Internal Trip Allowance
Yes No ( % Trip Discount)
Pass-By Trip Allowance Yes No ( % Trip Discount)
A passby trip discount of 25% is allowed for appropriate land uses. The passby trips at adjacent study
area intersections and project driveways shall be indicated on a report figure.
B. Trip Geographic Distribution: N % S % E % W %
(attach exhibit for detailed assignment)
C. Background Traffic
Project Build-out Year:
Provide realistic opening year, considering
time needed for approvals and construction.
Phase Year(s) _________________
Annual Ambient Growth Rate: %
Other area projects to be analyzed:
Model/Forecast methodology
Traffic Impact Analysis -15- April 2008
Preparation Guide
Exhibit B – Scoping Agreement – Page 2
D. Study intersections:
(NOTE: Subject to revision after other projects, trip generation and distribution
are determined, or comments from other agencies.)
1.
2.
3.
4.
5.
E. Study Roadway Segments:
(NOTE: Subject to revision after other projects, trip generation and
distribution are determined, or comments from other agencies.)
1.
2.
3.
4.
5.
E. Other Jurisdictional Impacts
Is this project within a City’s Sphere of Influence or one-mile radius of City boundaries?
Yes No
If so, name of City Jurisdiction:
F. Site Plan
(please attach reduced copy)
G. Specific issues to be addressed in the Study (in addition to the standard analysis described
in the Guideline)
(To be filled out by Transportation Department)
(NOTE: If the traffic study states that “a traffic signal is warranted” (or “a traffic signal appears to be warranted,” or
similar statement) at an existing unsignalized intersection under existing conditions, 8-hour approach traffic volume
information must be submitted in addition to the peak hourly turning movement counts for that intersection.)
H. Existing Conditions
Traffic count data must be new or recent. Provide traffic count dates if using other than new counts.
Date of counts______________________________________________________________________
*NOTE* Traffic Study Submittal Form and appropriate fee must be submitted with, or prior to
submittal of this form. Transportation Department staff will not process the Scoping
Agreement prior to receipt of the fee.
Recommended by:
______________________________ _________
Consultant’s Representative Date
Scoping Agreement Submitted on _____________
Revised on ___________________
Approved Scoping Agreement:
_________________________ ________
Riverside County Transportation Date
Department
6.
7.
8.
9.
10.
6.
7.
8.
9.
10.
Traffic Impact Analysis -16- April 2008
Preparation Guide
Exhibit C
SIGNALIZED INTERSECTION ANALYSIS INPUT PARAMETERS
PARAMETER
VALUE
Base Saturation Flow Rate 1900 pc/hr/ln
Heavy Vehicle factor Determine % heavy vehicle in existing traffic stream based
on count data or consultation with County Transportation
Dept. Projects with truck intensive uses must convert project
trips to passenger car equivalents (PCE=2). Truck intensive
uses include heavy industrial, warehousing or as determined
by the Transportation Department.
Grade Include as appropriate
Exclusive left turn lane peak hour volume > 100
Dual left turn lanes peak hour volume > 300
Protected Left Turn Phasing Left turn volume > 240 vph
Minimum green time 7 seconds each movement in areas of light pedestrian
activity. In areas of heavy pedestrian activity, the minimum
green shall be calculated based on the methodology in the
HCM.
Cycle length 60 sec to 120 sec
Lost time Per HCM Exhibit 10-17 (below)
Major street Minor Street Number of Phases L (s)
Protected Protected 4 16
Protected Permitted 3 12
Permitted Protected 3 12
Permitted Permitted 2 8
* All above values are from HCM2000 Chapters 10 and 16. Any deviation from these parameters
requires prior approval from Riverside County Transportation Department. Refer to HCM2000 for
any default values not specifically identified here.
Intersection analyses should be conducted utilizing acceptable software based on HCM
methodology. Closely spaced intersections are to be analyzed using analysis tools capable of
accounting for turn lane storage, queue length, blockage, etc. such as Synchro.
Actual signal timing and peak hour factors should be collected in the field and utilized in the
existing and near-term analyses. In cases where traffic is added from a significant number of
cumulative projects, the consultant shall use their engineering judgment in the application of peak
hour factors to maintain consistency with the existing conditions analyses. A peak hour factor of
1.0 shall be applied to buildout traffic conditions.
Traffic Impact Analysis -17- April 2008
Preparation Guide
Exhibit D
Traffic Impact Analysis Format
The Traffic Impact Analysis shall generally include the following items, unless waived by the
Transportation Department. Required Exhibits and Tables are indicated.
I. Introduction
A. Purpose of the TIA and Study Objectives
B. Site location and study area (Exhibit 1)
C. Development project identification - Riverside County Case Number and related case
numbers, i.e. S.P.A. amendment number, E.I.R. number, etc.
D. Development project description
1) Project size and description
2) Existing land use and zoning
3) Proposed land use and zoning
4) Site plan of proposed project (reduced) (Exhibit 2)
5) Proposed project opening year
6) Any proposed project phasing
7) Indicate if project is within a City Sphere of Influence
II. Area Conditions
A. Identify Study Area and Intersections
B. Existing traffic controls and intersection geometrics (Exhibit 3) - include descriptions
of existing roads (number of lanes, etc.)
C. Existing traffic volumes - AM and PM peak hour turning movements and roadway
links (if required) (Exhibit 4A - AM and Exhibit 4B -PM)
Traffic Impact Analysis -18- April 2008
Preparation Guide
Exhibit D continued
D. Existing delay and Level of Service at study intersections/roadway links (Table 1)
E. Provide copy of General Plan Circulation Element in the project vicinity (Exhibit 5)
F. Indicate if Transit service is available in the area and along which routes
III. Projected Future Traffic
A. Project Traffic and Project Phasing (each study year)
1. Ambient growth rate
2. Project Trip generation (Table 2) - (the latest edition of the Institute of
Transportation Engineers (ITE) Trip Generation Report
). Other sources require
prior approval by the Transportation Department
3. Project Trip distribution and assignment (Exhibit 6)
4. Other factors affecting trip generation (identify any factors used to adjust trip
generation, such as pass-by trips, internal trips, or modal choice. Use of any
factors require prior approval by the Transportation Department and should be
based on accepted traffic engineering documentation such as trip generation
manual or other.
5. Project peak hour turning movement traffic (Exhibit 7A & 7B - AM and PM)
6. Project completion or phase completion traffic volumes (Exhibits 8A and 8B –
AM and PM, for project or Phase I completion, 8C and 8D for Phase II, etc.)
C. Cumulative Traffic (background)
1. Ambient growth rate
2. Identify location of other approved or proposed development projects (Exhibit 9)
3. Trip generation from other approved projects (Table 3)
4. Trip distribution and assignment of other approved development projects
(Exhibits 9A, 9B, etc.)
5. Total background peak hour turning movement volumes (Exhibits 10A & 10B –
AM and PM)
Traffic Impact Analysis -19- April 2008
Preparation Guide
Exhibit D continued
IV. Traffic Analysis
A. Capacity and Level of Service and Improvement Analysis
1. Delay and Level of Service for existing traffic conditions without project, with
existing improvements (Table 4)
2. Delay and Level of Service at study years with project, with existing and
committed improvements (funded for construction) (Table 5)
3. Delay and Level of Service at study years with
additional improvements (if
required to achieve the General Plan required Level of Service) (Table 6)
4. Delay and Level of service under Cumulative conditions, with existing and
committed improvements (funded for construction) and without and with additional
improvements (Tables 7 and 8)
V. Findings and Recommendations
A. Traffic Impacts and Level of Service Analysis
1. Proposed mitigation measures to achieve LOS at impacted intersections (list as
Table 9 and
also show graphically as Exhibit 11) Identify if improvements are
scheduled for construction, funded for future implementation by a regional
mechanism, or not funded.
B. Traffic signal warrant analysis - indicate intersections found to meet signal warrants
at study year and share of project traffic contribution (use peak hour for existing
intersections and daily for new intersections).
C. Circulation recommendations
1. On-site
2. Area wide - provide exhibit showing roadway improvements and signal locations
(Exhibit 12)
3. Phasing (if appropriate)
D. Safety and operational improvements
E. Specific Plan signalization analysis (for Specific Plans only)
Traffic Impact Analysis -20- April 2008
Preparation Guide
Exhibit D continued
F. General Plan Conformance (for Specific Plans and General plan amendments only)
(show any proposed General Plan Amendments as Exhibit 13)
G. CETAP Conformance (show any CETAP corridors adjacent to project as Exhibit 14)
H. Identify existing or proposed Regional funding mechanisms
Traffic Impact Analysis -21- April 2008
Preparation Guide
Exhibit E
Level of Service Standards
Refer to County General Plan, Chapter 4, Pages C-9 and 10
TRAFFIC STUDY SUBMITTAL FORM
THIS FORM MUST BE SUBMITTED WITH THE FIRST SCOPING AGREEMENT
RIVERSIDE COUNTY TRANSPORATION
4080 Lemon Street, 8th Floor
Riverside, CA 92501
PHONE (951) 955-6761 FAX (951) 955-0049
-22-
EXHIBIT F
PROJECT INFORMATION
PARENT CASE #
(TR, PM, PP, CUP, SP, PAR)
FAST TRACK NUMBER
(IF APPLICABLE)
RELATED CASES
(IF APPLICABLE)
PROJECT NAME
DESCRIPTION
LOCATION
(CROSS STREETS OR ADDRESS)
APN THOMAS BROS. PAGE/GRID
ENGINEERING FIRM
NAME
ADDRESS
CITY/STATE/ZIP CODE
DESCRIPTION
CONTACT PERSON E-MAIL
PHONE FAX
APPLICANT
NOTE: THE APPLICANT WILL RECEIVE ALL BILLINGS, CORRESPONDENCE & REFUNDS FOR DEPOSIT BASED FEES.
NAME
ADDRESS
CITY/STATE/ZIP CODE
DESCRIPTION
CONTACT PERSON E-MAIL
PHONE FAX
OWNER
NAME
ADDRESS
CITY/STATE/ZIP CODE
DESCRIPTION
CONTACT PERSON E-MAIL
PHONE FAX
IF THE ENGINEER, APPLICANT OR OWNER CHANGES, IT IS THEIR RESPONSIBILITY TO LET THE RIVERSIDE COUNTY TRANSPORTATION
KNOW, AS IT WILL MISDIRECT THE REFUND AT THE END OF THE PROJECT.
PRINT NAME SIGNATURE DATE
Traffic Impact Analysis -23- April 2008
Preparation Guide
Exhibit G
TRANSPORTATION CONSULTANTS
The following firms are recognized by the Riverside County Transportation Department as
competent, professional traffic engineering and/or transportation planning entities that have done
work in Riverside County. This list is provided for informational purposes only and does not
constitute a requirement to use consultants only on this list.
1. ADVANTEC Consulting Engineers
21700 Copley Drive, Ste. 350
Diamond Bar, CA 91765
Betsy Scott, Marketing Dir./Ofc. Mgr.
(909) 860-6222 FAX: (909) 860-6722
2. Albert A. Webb Associates
3788 McCray Street
Riverside, CA 92506
Dilesh Sheth, Traffic Engineer
(909) 686-1070 FAX (909) 788-1256
3. Robert Crommelin & Associates, Inc.
73-255 El Paseo, Ste. 9
Palm Desert, CA 92260
Robert W. Crommelin P.E. (FL)
(760) 568-6838 FAX (760) 568-9850
4. Darnell & Associates, Inc.
1446 Front Street Ste. 300
San Diego, CA 92101
Bill E. Darnell, P.E.
(619) 233-9373 FAX (619) 233-4034
5. Endo Engineering
28811 Woodcock Drive
Laguna Niguel, CA 92677-1330
Gregory Endo, Principal
(949) 362-0020 FAX (949) 362-0015
6. Albert Grover & Associates
211 E. Imperial Highway, Ste. 208
Fullerton, CA 92835
New Cases: Rob Kuehn
(714) 992-2990 FAX (714) 992-2883
7. KOA Corp.
Mujib Ahmed, P.E.
3190 C Shelby Street
Ontario, CA 91764
(909) 890-9693 FAX (909) 890-9694
8. Kimley-Horn and Associates, Inc.
765 The City Drive, Suite 400
Orange, CA 92868
Serine A. Ciandella, AICP
(714) 939-1030 FAX (714) 938-9488
9. Krueper Engineering & Associates, Inc.
568 N. Mt. View Avenue, 2nd Floor
San Bernardino, CA 92401
Harry Krueper, P.E.
(909) 884-2159 FAX (909) 888-8910
10. Kunzman Associates
1111 Town & Country, Ste. 34
Orange, CA 92868
William Kunzman, PE, Senior Principal
Carl Ballard, Senior Associate
(714) 973-8383 FAX (714) 973-8821
11. Linscott Law & Greenspan Engineers
1565 Hotel Circle South, Ste. 310
San Diego, CA 92108
John Keating, P.E., Principle
(619) 299-3090 FAX (619) 299-7041
12. LSA Associates, Inc.
1500 Iowa Ave., Suite 200
Riverside, CA 92507
(951) 781-9310 FAX (951) 781-4277
Traffic Impact Analysis -24- April 2008
Preparation Guide
13. Iteris, Inc.
707 Wilshire Boulevard, Ste. 4810
Los Angeles, CA 90017
Michael Meyer, T.E.
(213) 488-0345 FAX (213) 488-9440
14. Parsons Brinkerhoff
505 S. Main Street, Ste. 900
Orange, CA 92868
(714) 973-4880 FAX (714) 973-0358
15. P&D Consultants, Inc.
999 Town & Country Road, 4
th
Floor
Orange, CA 92868
Michael Benner, P.E.
(714) 835-4447 FAX (714) 285-0740
16. RBF Consulting
14725 Alton Parkway
Irvine, CA 92618
Carlos Ortiz, P.E.
(949) 472-3505 FAX (949) 472-8373
17. R.K. Engineering Group
3991 MacArthur Boulevard, Ste. 310
Newport Beach, CA 92660
Robert Kahn, P.E., Principal
(949) 474-0809 FAX (949) 474-0902
1
8. Rick Engineering
1223 University Ave., Suite 240
Riverside, CA 92507
Kathy Barosko
(951) 782-0707 FAX: (951) 782-0723
19. TEP
P.O. Box 18355
Irvine, CA 92623
Craig Neustaedter
(949) 552-4357 Cell (909) 263-0383
FAX (909) 494-4408
tepirvine@sbcglobal.net
20. Traffic Safety Engineers
3100 Marywood Drive
Orange, CA 92867
C. Hui Lai, P.E., Traffic Engineer
(714) 974-7863 FAX (714) 974-1043
21. Urban Crossroads
41 Corporate Park, Ste. 300
Irvine, CA 92606
John Kain, AICP
(949) 660-1994 FAX (949) 660-1911
22. URS/BRW
2020 E. 1
st
Street, Ste. 400
Santa Ana, CA 92705
Doug Smith, P.E.
(714) 835-6886 FAX (714) 667-7147
23. Wilbur Smith Associates
900 Wilshire Blvd., Suite 930
Los Angeles, CA 90017
Sam Morrissey
(213) 627-3855 FAX (213) 627-3859
24. Willdan
2401 East Katella Ave., Suite 450
Anaheim, CA 92806
Lewis Gluesing
Division Manager, Traffic Engineering
(714) 978-8200 FAX (714) 978-8299
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