61-9-312. Performance ability of brakes. (1) Every motor vehicle and combination of vehicles, at all times and under all conditions of loading, upon application of the service brake, shall be capable of:
     (a) developing a braking force that is not less than the percentage of its gross weight tabulated in subsection (3) for its classification;
     (b) decelerating to a stop from not more than 20 miles per hour at not less than the feet per second per second tabulated in subsection (3) for its classification; and
     (c) stopping from a speed of 20 miles per hour in not more than the distance tabulated in subsection (3) for its classification, such distance to be measured from the point at which movement of the service brake pedal or control begins.
     (2) Tests for deceleration and stopping distance shall be made on a substantially level (not to exceed plus or minus 1% grade), dry, smooth, hard surface that is free from loose material.
     (3)
     
                 Brake system
                 application and
     Braking force           braking distance
     as a percentage     Deceleration     in feet from an
     of gross vehicle     in feet     initial speed of
     or combination     per second     twenty (20)
     weight     per second     miles per hour
     

     
     Classification of Vehicles
     A Passenger vehicles with a seating capacity of
     ten (10) people or less including driver, not having a manufacturer's gross
     vehicle weight rating......     
     52.8%     17     25
     B-1 All motorcycles, quadricycles, and motor-driven
     cycles......     
     43.5%     14     30
     B-2 Single unit vehicles with a manufacturer's gross vehicle weight rating
     of than ten thousand (10,000) pounds or less......     
     43.5%     14     30
     C-1 Single unit vehicles with a manufacturer's gross weight rating of more
     than ten thousand (10,000) pounds......     
     43.5%     14     40
     C-2 Combination of a two-axle towing vehicle and a trailer with a gross
     trailer weight of three thousand (3,000) pounds or less......     
     43.5%     14     40
     C-3 Buses, regardless of the number of axles, not having a manufacturer's
     gross weight rating......     
     43.5%     14     40
     C-4 All combinations of vehicles in driveaway-towaway
     operations......     
     43.5%     14     40
     D All other vehicles and combinations of vehicles......     
     43.5%     14     50
     

     History: En. Sec. 2, Ch. 139, L. 1965; R.C.M. 1947, 32-21-143.2; amd. Sec. 44, Ch. 516, L. 1985.