VAIL, Colo. (AP) – The Colorado Department of Transportation is warning motorists of traffic problems as authorities prepare for the USA Pro Cycling Challenge bicycle race.

According to the Vail Daily, race officials are estimating the race may draw more than one million spectators over the course of seven days beginning Aug. 22.

The race will cover more than 500 miles of Colorado terrain, including Aspen, Avon, Breckenridge, Colorado Springs, Denver, Gunnison, Salida and Steamboat Springs.

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