CDOT gives a letter grade to overall roadway condition. It is a combination of the percent of highway pavement determined to have high or moderate Drivability Life and the level of service (LOS) delivered by CDOT’s maintenance program. The Department in 2013 changed its way of evaluating pavement condition. Grades for previous years are not directly comparable.

Mileposts (or mile markers) along highways and their locations collection during GPS mapping efforts in the early 2000s from the Colorado Department of Transportation (CDOT).

Number of traffic fatalities each year on Colorado roads

Colorado Department of Transportation five year IT roadmap.

County boundaries and area, from the Colorado Department of Transportation (CDOT) for 64 counties in the state of Colorado.

Number of people involved in traffic incidents on Colorado roads that resulted in evident injuries, whether incapacitating or not.

The tunnel maintenance program tracks CDOT progress in maintaining tunnels on the State Highway System. A letter grade is given every year on maintenance activities at the Eisenhower-Johnson and Hanging Lake tunnels on I-70. Maintenance on these aging tunnels includes tunnel washing and sweeping, ventilation maintenance, snow removal, emergency response and round-the-clock television surveillance.

County boundaries and area, from the Colorado Department of Transportation (CDOT) for 64 counties in the state of Colorado.

Congestion measurements are defined by travel-time delay, which is the difference between the travel time on highways at the free flow speed and the time spent in current traffic. In 2012, the average travel-time delay on all congested corridors was 17.2 minutes per traveler, per day. A highway is considered congested when the peak traffic volume is 85 percent or greater than what the highway was designed to sustain.

Airport locations, nearby city, recreation in the area, and more with associated data (hours, annual number of passengers, etc) from the Colorado Department of Transportation (CDOT).