U.S. Highway 6 (US 6) is a part of the United States Numbered Highway System that travels from Bishop, California, to Provincetown, Massachusetts. In the U.S. state of Colorado, US 6 is an east–west highway stretching from Utah to Nebraska. Much of the route overlaps other highways in Colorado, and, as a result, much of US 6 is unsigned.
The 6th Avenue Freeway in Denver, looking east from Knox Court
Loveland Pass in 1964
US 6 in Lakewood
US 6 in Summit County
Interstate 70 in Colorado
Interstate 70 (I-70) is a transcontinental Interstate Highway in the United States, stretching from Cove Fort, Utah, to Baltimore, Maryland. In Colorado, the highway traverses an east–west route across the center of the state. In western Colorado, the highway connects the metropolitan areas of Grand Junction and Denver via a route through the Rocky Mountains. In eastern Colorado, the highway crosses the Great Plains, connecting Denver with metropolitan areas in Kansas and Missouri. Bicycles and other non-motorized vehicles, normally prohibited on Interstate Highways, are allowed on those stretches of I-70 in the Rockies where no other through route exists.
Westbound I-70 on a viaduct inside Glenwood Canyon, paralleling the Colorado River and former Denver and Rio Grande Western Railroad (now Union Pacific) main line
The western portal of the Hanging Lake Tunnel; at this point in the canyon both the river and the railroad are directly below the freeway viaducts.
Entrance to the Eisenhower Tunnel
Warning sign stating, "Trucks, Don't be Fooled—4 more miles [6.4 km] of steep grades and sharp curves"