Transportation Impact Analysis Guidelines

Development proposals that are subject to SEPA require a traffic impact analysis to determine transportation concurrency and to estimate traffic impacts and mitigation. Development proposals exempt from SEPA exemptions listed in KMC 24.02.065.

To assist applicants in the preparation of the transportation concurrency and traffic impact analyses, the City has established Transportation Impact Analysis Guidelines(PDF, 364KB). The goals of these guidelines are:

  • To assist in the determination of project compliance with transportation concurrency requirements;
  • To allow a thorough and complete review of potential traffic impacts; and
  • To ensure that review and mitigation of all proposals occur in a consistent and equitable manner.

The guidelines are intended to cover a wide variety of situations and do not include special requirements that may apply to a specific proposal. To be sure that a specific traffic analysis contains the proper information, please review these guidelines with staff from the Public Works Department or from the Planning and Building Department.

The following files have been prepared in Adobe Acrobat. You will need Adobe Acrobat Reader (a free program) to view or print PDF files.  Get Adobe Acrobat Reader.

TIAG Guidelines Memorandum(PDF, 364KB)
City of Kirkland TIAG Guidelines:
- Appendix A - Impact Fee Ordinance and Impact Fee Schedule
- Appendix B - Concurrency Management
- Appendix C - Transportation Section of Comprehensive Plan
- Proportional Share Impact Calculation Worksheet(PDF, 27KB) (Microsoft Excel(XLS, 50KB) )

Transportation Concurrency Application(PDF, 119KB)  

Concurrency Level of Service Update

City Council adopted a new Comprehensive Plan, including a new transportation element, along with companion revisions to Concurrency (Kirkland Municipal Code Title 25) on December 8. 2015. New concurrency methodology was effective January 1, 2016.  

Traffic concurrency levels of service standards, shown in the Traffic Impact Analysis Guidelines (TIAG) and in Appendix C of the TIAG, are being updated to reflect the newly adopted concurrency testing procedures as described below.

Illustration of Concurrency Testing Thresholds

KMC Section 25.10.020 (Procedures) (4) specifies when concurrency testing is required:

- Changes to the uses, densities, and intensities that create an additional impact of more than 10 person trips or that result in a total project impact of more than 40 person trips shall be subject to an additional concurrency test.  Changes to the uses, densities, and intensities that create a reduced impact do not require an additional concurrency test.

The KMC Section 25.10.030 (Test) (2) specifies the testing methodology:

- For roads, the concurrency test consists of comparing the existing person trip capacity to the estimated person trip generation of the development being tested.  The test is passed if the existing capacity is greater than the estimated person trip generation.

The current adopted concurrency standard is the existing person trip capacity.  The existing person trip capacity is a function of the amount of funded capacity improvement projects that are in the adopted transportation capital facility plan (CFP).  

Kirkland’s current trip capacity standard is 11,716 person trips.

Developments applying for concurrency shall be tested against the standard until person trip capacity is altered by revisions to the funded transportation CIP or to the transportation CFP.

Find out more information on KMC Title 25.