Roy, WA (May 20, 2026) – A two-vehicle collision slowed traffic on Wednesday morning, May 20, along southbound State Route 507 near milepost 32 by 336th Street South. The Washington State Department of Transportation first reported the backup in a social media update posted around 9:19 a.m.
The Washington State Patrol said one person asked for medical assistance following the wreck. Trooper Kameron Watts stated that the cause had not yet been determined. Emergency units worked near the highway while traffic moved through a single open lane.
No names were released following the roadway accident. Additional details had not been made public as of Wednesday afternoon.
Investigators are still working to determine what led to the two-car roadway disruption. We hope the person receiving treatment makes a full recovery.
How Traffic Delays Often Develop After Highway Accidents
Traffic backups can form quickly after an accident blocks part of a busy highway. Even when only one lane is closed, vehicles may slow for several miles as drivers approach emergency activity and merge into open lanes. Morning travel periods are especially vulnerable to delays because traffic volume is already higher during commuting hours.
Drivers passing through a blocked section may also face sudden stops and changing traffic patterns. In many cases, crews must move damaged vehicles, clear debris, and make sure the roadway is safe before normal travel resumes. Weather, visibility, and road design can also affect how long congestion lasts. Public transportation updates and highway alerts are often used to help drivers avoid extended delays and choose alternate routes when available.
