RCW 47.52.200: Law enforcement jurisdiction within city or town.

Whenever any limited access highway facility passes within or through any incorporated city or town the municipal police officers of such city or town, the sheriff of the county wherein such city or town is situated and officers of the Washington state patrol shall have independent and concurrent jurisdiction to enforce any violation of the laws of this state occurring thereon: PROVIDED, The Washington state patrol shall bear primary responsibility for the enforcement of laws of this state relating to motor vehicles within such limited access highway facilities.