Chapter 12.50
TRAFFIC IMPACT ANALYSIS REQUIREMENTS
Sections:
12.50.030 Organization and content.
12.50.010 Purpose.
It is the purpose of this chapter to outline the minimum content of a traffic impact analysis where required. A traffic impact analysis responds to a wide variety of issues, varying with the type of development, location of the proposed project, and existing traffic patterns. There are a number of issues that are incorporated into a traffic impact analysis to ensure an efficient and comprehensive review of the impacts associated with a development proposal. [Ord. 1694 § 1 (Att. A-2), 2024.]
12.50.020 Applicability.
A. A traffic impact analysis shall be submitted with a development permit application when it is determined by the city engineer that a development meets any of the following:
1. Generates 20 peak hourly trips or 200 average daily trips;
2. Exceeds the current or projected level of service of the roadway system adjacent to the development; or
3. The proposal would affect existing traffic problems in the local area of the project such as an area with a high accident ratio, confusing intersection, or other problems identified by the city engineer; or
4. A traffic impact analysis may also be required by the city engineer when it is determined that a development proposal may significantly impact adjacent areas.
B. Traffic impact analyses shall be prepared by a qualified engineer approved by the city engineer. [Ord. 1694 § 1 (Att. A-2), 2024.]
12.50.030 Organization and content.
A traffic impact analysis shall contain the following information:
A. Introduction and Summary.
1. Purpose of report and study objectives;
2. Executive summary:
a. Site location and study area;
b. Development description;
c. Principal findings;
d. Conclusions;
e. Recommendations and proposed mitigation measures.
B. Proposed development and summary of the development proposal, including the following:
1. Land use and intensity;
2. Location;
3. Site plan;
4. Zoning;
5. Phasing and timing.
C. Area conditions including the following:
1. Study area:
a. Area of influence;
b. Area of significant traffic impact.
2. Study area and land use:
a. Existing land uses;
b. Existing zoning;
c. Anticipated future development.
3. Site accessibility:
a. Existing and future area roadway system;
b. Traffic volumes and conditions;
c. Transit service;
d. Existing relevant transportation system management programs;
e. Other issues as determined by the city engineer and director.
D. Projected Traffic.
1. Site traffic for each horizon year:
a. Trip generation;
b. Trip distribution;
c. Modal split;
d. Trip assignment.
2. Through traffic (each horizon year):
a. Method of projection;
b. Nonsite traffic in study area including the method of projections, trip generation, trip distribution, modal split, and trip assignment;
c. Through traffic;
d. Estimated volumes.
3. Total traffic (each horizon year).
E. Traffic analysis including the following:
1. Site access;
2. Capacity and level of service, as defined in the comprehensive plan;
3. Traffic safety;
4. Traffic signals;
5. Site circulation and parking.
F. Improvement Analysis.
1. Improvements to accommodate base traffic;
2. Additional improvements to accommodate site traffic;
3. Alternative improvements;
4. Status of improvements already funded, programmed, or planned;
5. Evaluation.
G. Findings.
1. Site accessibility;
2. Traffic impacts;
3. Need for any improvements and financing plan;
4. Compliance with applicable codes.
H. Recommendations and Proposed Mitigation.
1. Site access/circulation plan;
2. Roadway improvements including on site, off site and a phasing plan when appropriate;
3. Transportation system management actions including off site, on site and operational.
I. Conclusions. [Ord. 1694 § 1 (Att. A-2), 2024.]