The wheelchair conveyance must be equipped with a propulsion device capable of propelling the vehicle at a minimum speed of 20 mph on level ground.

(1) Every wheelchair conveyance that is designed to travel on four wheels in contact with the ground must comply with the provisions of chapter 46.37 RCW as they pertain to motor vehicle equipment.

(2) Every wheelchair conveyance that is designed to travel on not more than three wheels in contact with the ground must comply with the equipment requirements for motorcycles, motor-driven cycles, and mopeds contained in chapters 46.37 and 46.61 RCW: Provided, That all wheelchair conveyances must be equipped with two rear view mirrors and turn signals as defined in RCW 46.37.400 and 46.37.200.