Washington Revised Code Title 46. Motor Vehicles § 46.37.510. Seat belts and shoulder harnesses

(1) No person may sell any automobile manufactured or assembled after January 1, 1964, nor may any owner cause such vehicle to be registered thereafter under the provisions of chapter 46.12 RCW unless such motor car or automobile is equipped with automobile seat belts installed for use on the front seats thereof which are of a type and installed in a manner conforming to rules adopted by the state patrol. Where registration is for transfer from an out-of-state license, the applicant shall be informed of this section by the issuing agent and has thirty days to comply. The state patrol shall adopt and enforce standards as to what constitutes adequate and safe seat belts and for the fastening and installation of them. Such standards shall not be below those specified as minimum requirements by the Society of Automotive Engineers on June 13, 1963.

(2) Every passenger car manufactured or assembled after January 1, 1965, shall be equipped with at least two lap-type safety belt assemblies for use in the front seating positions.

(3) Every passenger car manufactured or assembled after January 1, 1968, shall be equipped with a lap-type safety belt assembly for each permanent passenger seating position. This requirement shall not apply to police vehicles.

(4) Every passenger car manufactured or assembled after January 1, 1968, shall be equipped with at least two shoulder harness-type safety belt assemblies for use in the front seating positions.

(5) The state patrol shall excuse specified types of motor vehicles or seating positions within any motor vehicle from the requirements imposed by subsections (1), (2), and (3) of this section when compliance would be impractical.

(6) No person may distribute, have for sale, offer for sale, or sell any safety belt or shoulder harness for use in motor vehicles unless it meets current minimum standards and specifications conforming to rules adopted by the state patrol or the United States department of transportation.