Seattle Police officers will perform intermittent rolling slowdowns on both directions of the Alaskan Way Viaduct from 7:30-9:30 p.m. Wednesday so that a commercial can be filmed.
Washington Department of Transportation says drivers should expect up to 30-minute delays.
Northbound SR 99 traffic will gradually slow to 10 mph starting near South Royal Brougham Way. Southbound SR 99 traffic will slow down near Western Avenue. Pilot cars will lead the slowed traffic across the viaduct until the roadway is clear, then allow traffic to accelerate back to highway speeds.