Colorado Code § 42-4-105

Local traffic control devices. Local authorities in their respective jurisdictions shall place and maintain such traffic control devices upon highways under their jurisdiction as they may deem necessary to indicate and to carry out the provisions of this article or local traffic ordinances or to regulate, warn, or guide traffic, subject in the case of state highways to the provisions of sections 42-4-110 and 43-2-135 (1)(g), C.R.S

All such traffic
control devices shall conform to the state manual and specifications for statewide uniformity as
provided in section 42-4-104.