SDCL § 32-18-12: Towing vehicles with vacuum brakes--Operation of towed vehicle brakes--Independent control system--Automatic application--Violation as misdemeanor.

Every towing vehicle used to tow other vehicles equipped with vacuum brakes, in operations other than driveaway or towaway operations, shall have, in addition to the single control device required by § 32-18-10, a second control device which can be used to operate the brakes on towed vehicles in emergencies. The second control shall be independent of brake air, hydraulic, and other pressure, and independent of other controls, unless the braking system be so arranged that failure of the pressure upon which the second control depends will cause the towed vehicle brakes to be applied automatically. The second control is not required to provide modulated braking. A violation of this section is a Class 2 misdemeanor.