Colorado Revised Statutes Title 42. Vehicles and Traffic § 42-4-614. Designation of highway maintenance, repair, or construction zones--signs--increase in penalties for speeding violations

(2) The department of transportation or other public entity must designate a maintenance, repair, or construction zone by erecting or placing an appropriate sign in a conspicuous place before the area where the maintenance, repair, or construction activity is taking place or, if the zone is not on a state highway, will be taking place within four hours. The sign must notify the public that increased penalties for certain traffic violations are in effect in the zone. The department of transportation or other public entity must erect or place a second sign after the zone indicating that the increased penalties for certain traffic violations are no longer in effect. A maintenance, repair, or construction zone begins at the location of the sign indicating that increased penalties are in effect and ends at the location of the sign indicating that the increased penalties are no longer in effect.

(3) Signs used for designating the beginning and end of a maintenance, construction, or repair zone shall conform to department of transportation requirements. The department of transportation or other public entity may display such signs on any fixed, variable, or movable stand. The department of transportation or other public entity may place such a sign on a moving vehicle if required for certain activities, including, but not limited to, highway painting work.