West Union is an urban arterial; the speed limit is 45 west of 185th to Dick Road, which is appropriate for this road classification. (See our Road Classifications infographic.) Engineering studies have shown that motorists drive at a speed they feel is comfortable for the conditions, often regardless of what speed is posted on the signs. To avoid a speed trap, Oregon laws direct that speed zones must not vary significantly from the speed that the majority (85%) of traffic is traveling. Read the Oregon Department Transportation (ODOT) FAQs on speed zoning.
Our most recent speed study in this area of West Union Road was done on March 9, 2023. The 85th percentile speed was 50 mph. The average speed was 45 mph.
Speeding is a choice that drivers make and changing driver behavior is most effectively achieved through enforcement. We encourage you to contact the Washington County Sheriff’s Office to provide extra enforcement. Request additional enforcement online.
Potentially changing the posted speed limit requires a process that can take up to/longer than a year. The final determination follows an investigative process outlined in the Oregon Administrative Rule, which gives ODOT the responsibility for making a final determination.
Changing the posted speed on West Union should be considered separately from the West Union Road/Neakahnie Avenue project.