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What is Concurrency?

Concurrency is one of 14 goals identified in the Growth Management Act (GMA - RCW36.70A). Concurrency is not a guarantee of system performance, rather, achievement of concurrency is when adequate public facilities are in place, and functioning at the adopted level-of-service (LOS) at the time development occurs.

Under the GMA, the adopted LOS serves as the local jurisdiction’s standard to measure the impacts new development would have on the local transportation system. If the impacts of a development request would result in LOS dropping below the standard, the local jurisdiction must change the standard or deny the development application unless the appropriate transportation improvements are made concurrently (within six years) with the development. 

Concurrency is a land use policy used by local governments to coordinate transportation and land use. Washington law also provides a number of ways for the state to address land use impacts on its transportation system, as described in the folio: Concurrency, Land Use, and the State Transportation System. (pdf 231 kb)

Legislative Concurrency Studies

The 2005 and 2006 Legislative Sessions resulted in two separate concurrency studies. Both projects were completed and submitted to the Legislature.

Options for Making Concurrency More Multimodal. (pdf 4.30 kb) (2005 Session) was completed by the Puget Sound Regional Council (PSRC) with oversight provided by a legislative workgroup and technical committee.

The GMA Concurrency Goal and the State Transportation System. (pdf 4 mb) (2006 Session) was conducted by WSDOT in collaboration with the Department of Commerce. A legislative workgroup, together with local government representatives, provided oversight to the analysis.