Section 31-5-955 - Windshields and wipers(a) No person shall drive any motor vehicle with any sign, poster or other material or substance upon or crack within the front windshield, side or rear windows of the vehicle which materially obstructs, obscures or impairs the driver's clear view of the highway or any intersecting highway.(b) The windshield on every motor vehicle shall be equipped with a device for cleaning rain, snow or other moisture from the windshield, which device shall be so constructed as to be controlled or operated by the driver of the vehicle. This subsection shall apply to multipurpose vehicles as defined in W.S. 31-1-101(a)(xv)(M) when equipped with a windshield and an enclosed cab.(c) Every motor vehicle shall be equipped with a windshield and a windshield wiper which shall be maintained in good working order.