< Colorado
Special Roads for Colorado
Colorado does not use the dirt road type unless it is for "2 track" unimproved roads. Any road that a highway vehicle could easily travel would not be considered a "Dirt Road/4x4 trail." See this Forest Service Roads section about Forest Service roads for some clarification.
If the road has been improved at all (meaning that it is a gravel road), we use the street road type. There may be special circumstances, so contact an Area Manager with any questions.
State Highway vs State Route
Colorado follows the state highway general guidelines, but for consistency throughout the state, Colorado uses State Highway (SH-xxx).