Colorado Revised Statutes Title 42. Vehicles and Traffic § 42-20-106. Regulatory authority of local governments--preemption--disposition of local fines and penalties

(1) Except as specifically authorized in parts 1, 2, and 3 of this article, no county, town, city, or city and county shall have any authority to regulate the transportation of hazardous materials separate and apart from the regulation of other commodities. However, a county, town, city, or city and county may adopt and enforce regulations or ordinances which are no more stringent than the provisions of state law and regulations adopted pursuant thereto, if violations of such local regulations or ordinances carry penalties which are not more than the penalties imposed upon violations of state law and regulations adopted pursuant thereto. Any local government which adopts a regulation or ordinance pursuant to this section shall file a certified copy of such regulation or ordinance, and any amendment thereto, with the patrol.

(2) No person shall be prosecuted for a violation of both the provisions of part 1, 2, or 3 of this article and the provisions of such local ordinance or regulation when such prosecution arises out of the same incident.