RCW 46.61.680: Lowering passenger vehicle below legal clearance—Penalty.

It is unlawful to operate any passenger motor vehicle which has been modified from the original design so that any portion of such passenger vehicle other than the wheels has less clearance from the surface of a level roadway than the clearance between the roadway and the lowermost portion of any rim of any wheel the tire on which is in contact with such roadway.

Violation of the provisions of this section is a traffic infraction.