Clearance lamps, side marker lamps, and identification lamps must be mounted as specified in 49 C.F.R. Part 571.108 (FMVSS 108) unless other requirements are outlined in RCW 46.37.090 or this section.

(1) Clearance lamps on vehicles manufactured prior to May 1, 1980, do not need to be visible at the inboard angles and need not comply with the mounting height requirements of 49 C.F.R. Part 571.108 (FMVSS 108).

(2) Specialized combination lamps designed to be mounted with the base at angles other than 0, 45, or 90 degrees from the longitudinal axis of the vehicle must be installed in accordance with the manufacturer's instructions.