Requires certain vehicles, that are making use of flashing lights that meet the requirements of RCW 46.37.300 or warning lights with three hundred sixty degree visibility to reduce the speed of the vehicle to fifty miles per hour or less, on a highway having four or more lanes, and to at least ten miles per hour below the posted speed limit, on a highway having less than four lanes.

Prohibits a person from driving a vehicle, at a speed greater than fifty miles per hour, in an area where a tow truck is making use of visual red lights meeting the requirements of RCW 46.37.196.