A. It shall be unlawful for a person to operate or permit the operation of the engine of a commercial vehicle so as to assist in braking or slowing the vehicle through the use of any engine brake or engine retarding device on any street or roadway within the city unless the vehicle is an emergency services vehicle.

B. Any violation of this section shall be punishable by a fine of one hundred dollars ($100.00). [Code 2004 § 12-39.]