Allowing single license plates for certain vehicles.

SB 5440 allows owners of specific vehicles - such as trailers, campers, motorcycles, mopeds, collector vehicles, or vehicles under 12,000 pounds gross weight - to display a single license plate instead of the standard two. The bill amends Washington state law to clarify that these vehicles may use one plate attached to the rear, while still requiring full registration fees as if two plates were issued. It updates display rules to permit temporary obstruction of the single plate by devices like trailer hitches or bike racks, provided the plate remains readable. This change directly affects owners of these vehicle types by simplifying plate requirements without altering fees. The bill focuses on administrative clarity for vehicle registration rules, not policy advocacy.