Colorado Revised Statutes Title 42. Vehicles and Traffic § 42-20-508. Route designation--motor vehicles

(1) The chief of the Colorado state patrol shall have the authority to adopt rules to designate which state highways shall be used and which shall not be used by motor vehicles transporting nuclear materials in this state.

(2) The carrier shall not deviate from the routes designated pursuant to subsection (1) of this section except in order to make local pickups and deliveries and in cases of emergency conditions which would make continued use of the designated route unsafe, or to refuel, or when the designated route is closed due to road conditions, road construction, or maintenance operations. When making local pickups and deliveries or when refueling, the carrier shall remain on the routes designated by the Colorado state patrol and shall minimize the distance traveled on nondesignated routes.