Colorado Revised Statutes Title 42. Vehicles and Traffic § 42-4-902. Limitations on turning around

(1) No vehicle shall be turned so as to proceed in the opposite direction upon any curve or upon the approach to or near the crest of a grade where such vehicle cannot be seen by the driver of any other vehicle approaching from either direction within such distance as is necessary to avoid interfering with or endangering approaching traffic.

(2) The driver of any vehicle shall not turn such vehicle at an intersection or any other location so as to proceed in the opposite direction unless such movement can be made in safety and without interfering with or endangering other traffic.

(3) Local and state authorities, within their respective jurisdictions, subject to the provisions of section 43-2-135(1)(g), C.R.S., in the case of streets which are state highways, may erect “U-turn” prohibition or restriction signs at intersections or other locations where such movements are deemed to be hazardous, and, whenever official signs are so erected, no driver of a vehicle shall disobey the instructions thereof.

(4) Any person who violates any provision of this section commits a class A traffic infraction.