Aspen Times
March 20, 2008, Associated Press

Gov. Bill Ritter has signed a bill that tightens the rules for off-road vehicles that allows 250 state officers to enforce laws on federal lands. The new law (House Bill 1069) prohibits motor vehicles from using public lands, trails, or roads unless it's authorized by a sign or other means....

http://aspentimes.com/article/20080320/NEWS/850954164