SDCL § 32-15-7: Windshield wipers required--Exceptions--Penalty.

The windshield on every motor vehicle as defined by § 32-3-1 except farm tractors and motorcycles, shall be equipped with a device for cleaning rain, snow, or other moisture from the windshield, which device shall be operated by the driver of the vehicle. No person may operate a motor vehicle upon the highways unless such vehicle shall be equipped with such device in good working order capable of cleaning the windshield thereof and which device shall provide the driver a clear view of the highway. A violation of this section is a petty offense.