Okla. Stat. tit. 47, § 47-12-302

A. Every motor vehicle or combination of vehicles, at all times

and under all conditions of loading, upon application of the service

brake, shall be capable of:

1. Developing a braking force that is not less than the

percentage of its gross weight, as specified in subsection D of this

section;

2. Decelerating to a stop from a speed of twenty (20) miles per

hour at not less than the rate specified in subsection D of this

section; and

3. Stopping from a speed of twenty (20) miles per hour in not

more than the distance specified in subsection D of this section,

such distance to be measured from the point at which movement of the

service brake pedal or control begins.

B. Upon application of the parking brake system and with no

other brake system applied, a motor vehicle or combination of motor

vehicles shall, at all times and under all conditions of loading, be

capable of stopping from a speed of twenty (20) miles per hour in

not more than the distance specified in subsection D of this

section, such distance to be measured from the point at which

movement of the emergency brake control begins.

C. Conformity to the stopping-distance requirements of

subsections A and B of this section shall be determined under the

following conditions:

1. Any test must be made with the vehicle on a hard surface

that is substantially level, dry, smooth, and free of loose

material; and

2. The vehicle must be in the center of a twelve-foot-wide lane

when the test begins and must not deviate from that lane during the

test.

D. Vehicle brake performance table:

Service Brake Systems Emergency

Brake Systems

Braking

force as Deceleration Application Application

percentage in feet and braking and braking

Type of of GVWR per second distance distance

Motor Vehicle or GCWR per second in feet in feet

1. Passenger-carrying

vehicle:

a. Vehicles with a

seating capacity of

Oklahoma Statutes - Title 47. Motor Vehicles Page 624

ten persons or less,

including the driver,

and built on a

passenger chassis: 65.2 21 20 54

b. Vehicles with a

seating capacity of

more than ten

persons, including

the driver, and built

on a passenger car

chassis; vehicles

built on a truck or

bus chassis and

having a

manufacturer's GVWR

of 10,000 pounds or

less: 52.8 17 25 66

c. All other

passenger-carrying

vehicles: 43.5 14 25 85

2. Property-carrying

vehicles:

a. Single-unit

vehicles with a

manufacturer's GVWR

of 10,000 pounds or

less: 52.8 17 25 66

b. Single-unit

vehicles with a

manufacturer's GVWR

of more than 10,000

pounds. Combinations

of a 2-axle towing

vehicle and trailer

having a GVWR of

3,000 pounds or less.

All combinations of

two or less vehicles

in drive-away or tow-

away combinations: 43.4 14 35 85

c. All other property-

carrying vehicles and

combinations of

property-carrying

vehicles: 43.5 14 40 90

E. Tests for deceleration and stopping distance shall be made

on a substantially level (not to exceed plus or minus one percent

Oklahoma Statutes - Title 47. Motor Vehicles Page 625

(1%) grade), dry, smooth, hard surface that is free from loose

material.