32-18-22. Low vacuum warning signal--Violation as misdemeanor.
Every truck tractor and truck used for towing a vehicle equipped with vacuum operated brakes and every truck with three or more axles using vacuum in the operation of its brakes, except those in driveaway or towaway operations, shall be equipped with a warning signal, other than a gauge indicating vacuum, readily audible or visible to the driver, which will operate at any time the vacuum in the vehicle's supply reservoir or reserve capacity is less than eight inches of mercury. A violation of this section is a Class 2 misdemeanor.
Source: SL 1967, ch 197, §1 (j) (2); SL 1989, ch 255, §82.