Interstate 25, Colorado, New Mexico and Wyoming

A major U.S. highway that runs mostly north-south, following the Front Range of the Rocky Mountains and crossing Wyoming, Colorado, and New Mexico. Part of the National Highway System that was authorized by the Federal Highway Act of 1956 under Dwight D. Eisenhower, Interstate 25 replaced several older roads and freeways. Its construction was intended to create a faster, easier connecting route between main cities in the three states including Cheyenne, Denver, and Albuquerque. In New Mexico, the route of the highway runs roughly along El Camino Real, the historic northbound road established by the Spanish in the 1600s, which in fact followed a long-existing trail used by the indigenous peoples of the area.