Originally Posted by Mark Doiron (Post 4016364)

What does that mean? In Colorado, many of the " trails" we drive are official county roads, numbered and maintained (such as snow plowing to open passes).

Colorado Trail Ride - Blanca Peak - 4 Wheel Drive & Sport Utility Magazine

And here. Skip to 3:25 ...

Colorado Campaign, July 2013, Part 1: http://youtu.be/yFjr3hSzEu4