Wash. Admin. Code § 204-36-050
(1) Authorized emergency vehicles must be:
(c) Legally equipped in conformance with RCW 46.37.190(1) with at least one lamp capable of displaying a red light visible from at least 500 feet in normal sunlight and a siren capable of giving an audible signal. Such equipment must not be installed prior to obtaining approval of the application and issuance of a temporary certificate of approval for the vehicle(s) by the patrol. To be considered approved equipment for use under the provisions of this section, all devices must meet the criteria established in RCW 46.37.320. In descending order of preference, these are:
(2) Authorized emergency vehicles must not:
(3) Authorized emergency vehicles may, in addition to the required equipment, have:
(c) Flashing or strobing headlamps;
provided that such equipment is listed on the application and approved by each primary jurisdiction and the patrol.
[Statutory Authority: RCW 46.37.005, 46.37.320, and 46.37.194. WSR 24-16-032, § 204-36-050, filed 7/29/24, effective 8/29/24; WSR 22-21-031, § 204-36-050, filed 10/6/22, effective 11/6/22. Statutory Authority: RCW 46.37.194. WSR 14-24-116, § 204-36-050, filed 12/3/14, effective 1/3/15. Statutory Authority: RCW 46.37.194 and 46.37.005. WSR 09-09-091, § 204-36-050, filed 4/16/09, effective 5/17/09. Statutory Authority: RCW 46.37.194. WSR 90-07-034, § 204-36-050, filed 3/15/90, effective 4/15/90; WSR 88-15-052 (Order 88-08-ESR), § 204-36-050, filed 7/18/88; Order 7301, § 204-36-050, filed 2/5/73.]