My street is an arterial and has a lot of speeders. How can I get the County to install speed humps?
King County does not recommend speed humps on arterial roadways. Arterials are considered the primary routes between communities, with speeds ranging from 35 mph to 55 mph and traffic volumes over 2,000 vehicles per day. These routes are designated to carry traffic from one neighborhood or city to another and are also the critical lifeline roadways used for fire and emergency response vehicles. The arterial roadway design is characterized by features that enhance traffic flow and increase safety, which include adding separated pedestrian facilities and illumination while minimizing direct residential/commercial access, on-street parking, and narrow, curvy lanes. Speed humps are a traffic calming treatment typically used to prevent traffic from using residential streets as a cut-through to access the arterial roadway system. If speeding is a problem, the Road Services Division’s Traffic Engineering & Maintenance Section can determine the extent of the problem and develop an appropriate
