It started on Aug. 20 and will conclude with a grand finish in Denver on Aug. 26.

More than 100 riders from 24 countries will visit 12 cities over the six days.

The race starts every morning around 10 a.m. During that time, traffic may be as slow as a snail in some locations as the cyclists make their way through the high country. On top of that, drivers will have to deal with the nearly one-million fans who come out to watch.

In good news, fans can also watch the USA Pro Challenge via the RadioShack Tour Tracker app. The tracker will cover the entire race every day and will give viewers the feeling that they are right along the road. Find out more about the app here,

Stage one started in Durango on Monday and headed to Telluride. On Tuesday, riders will start in Montrose and head to Mt. Crested Butte. In stage 3, they will go from Gunnison to Aspen. On Thursday, riders will go from Aspen to Beaver Creek. After that grueling stage, Friday will usher the riders from Breckenridge to Colorado Springs. The sixth stage will go from Golden to Boulder. The last stage will be in Denver for the individual time trial.

Find out more here,