Transportation Concurrency and Level of Service Development Regulations

On May 23, 2019 the City Council adopted code amendments via Ordinance O2019-484, which adds road segments and corridors to the City’s existing transportation concurrency program and level of service standards (LOS). Chapters 14A.05, 14A.10 and 21A.15 of the Sammamish Municipal Code (SMC) are affected by this ordinance. 

The key changes implemented by this ordinance include:

  • The LOS standard for road segments is a Volume to Capacity ratio (V/C) of 1.4 and the LOS standard for road corridors is a V/C of 1.1 for the City’s principal and minor arterials (except for East Lake Sammamish Parkway, which is excluded from this concurrency measurement). 
  • The adopted LOS standard of 1.1 V/C for road corridors resulted in a failure to meet the road corridor LOS along the Sahalee Way – 228th Ave North Corridor (extending from NE 12th Place to the north City limits).  However, on June 18, 2019, the City Council adopted the 2020 - 2025 TIP via Resolution R2019-839, which addresses the Sahalee Way – 228th Ave North Corridor failure.
  • There is now a requirement for a pre-application conference to be held prior to filing a Traffic Concurrency Review (TCR) application (see SMC 14A.10.020(4)) to receive a concurrency certificate.
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