Transportation concurrency
Transportation concurrency means that transportation facilities must be available to carry the traffic of a proposed development at County level of service standards, or else the proposed development cannot be approved.
A concurrency review must be completed by a King County Road Services Transportation Planner before you can apply for a development permit in unincorporated King County.
If standards are not met at the time you apply for development ("concurrent" with your application), the County can approve development only if financial commitments for improvements are made that will achieve the standards no later than 6 years after the development is approved. These commitments may be made by the County in its Capital Improvement Program, or by agreement between the County and the developer.
Please refer to
- King County Roads Services' Transportation Concurrency Management Program
- Transportation Concurrency Management Program FAQ.
- Application for Transportation Concurrency (PDF, 295KB)