Every motor vehicle or combination of vehicles, at all times and under all conditions of loading, upon application of the service (foot) brake, shall be capable of (a) developing a braking force that is not less than the percentage of its gross weight tabulated herein for its classification, (b) decelerating in a stop from not more than twenty (20) miles per hour at not less than the feet per second per second tabulated herein for its classification, and (c) stopping from a speed of twenty (20) miles per hour in not more than the distance tabulated herein for its classification, such distance to be measured from the point at which movement of the service brake pedal or control begins.

Classification of vehicles Braking force as a Deceleration in.......Brake system
and combinations percentage of gross feet per second......application and
vehicle weight or braking distance
combination weight in feet

__________________ .................................................._______________ _____________ _____________

Passenger vehicle, not including buses 52.8% 17 25

Single-unit vehicles with a manufacturer's
gross vehicle weight rating of less than
10,000 pounds ....... 43.5% 14 30

Single-unit, 2-axle vehicles with a
manufacturer's gross vehicle weight rating
of 10,000 or more pounds, and buses not
having a manufacturer's gross vehicle
weight rating .............. 43.5% 14 40

All other vehicles and combinations with
a manufacturer's gross vehicle weight
rating of 10,000 or more pounds .............. 43.5% 14 50

Tests for deceleration and stopping distance shall be made on a substantially level (not to exceed plus or minus one percent (1%) grade), dry, smooth, hard surface that is free from loose material.

Laws 1961, p. 405, § 12-302.