Rhode Island General Laws Title 31. Motor and Other Vehicles § 31-23-43. Wheel safety chocks

(a) Every bus having a seat capacity of more than seven (7) passengers, every truck with a gross weight of more than seven thousand pounds (7,000 lbs.), and every tractor or trailer, or combination, operated upon the public highways shall be equipped with one pair of approved wheel safety chock blocks. Whenever the motor vehicle shall be parked on a highway on a grade sufficient to cause the vehicle to move of its own momentum, and is left unattended by the operator, the safety chock blocks shall be securely placed around the rear wheel of the vehicle so as to prevent movement of the vehicle.

(b) Whenever the motor vehicle is equipped with positive spring-loaded air parking brakes, the vehicle need not be equipped with the safety wheel chocks.

(c) Violations of this section are subject to fines enumerated in § 31-41.1-4.