Colorado Revised Statutes Title 43. Transportation § 43-2-124. City streets defined--maintenance

(1) The city street system shall consist of all streets open and used, which shall include the primary system of major streets to be designated arterial streets, and a secondary system to be designated local service streets.

(2) Arterial streets are those streets carrying general traffic within the city and providing communication with surrounding territory and which are not part of the federal-aid and state highway connecting links within the city.

(3) Local service streets are all streets within a city open to public travel and which are not a part of the federal-aid connecting links, state highways, or streets designated as arterial streets.

(4) The city streets system, both arterial and local service streets, shall be constructed and maintained by the respective city, city and county, or incorporated town.