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.

Traffic counts on public roads under local jurisdiction in 2019. Provided by the CDOT.

Traffic counts on public roads under local jurisdiction in 2016. Provided by the CDOT.

Highway curvatures in sections across Colorado. Contains detailed data for state highways, including curvature from the Colorado Department of Transportation (CDOT).

Local road segments in Colorado with Curve and Grade data, data on High-Occupancy Lanes, Restricted Lanes, Reversible Lanes, Express or Toll Lanes.

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.

Road surface treatment planned (estimated) from 2015 through 2018 on highways in Colorado, from the Colorado Department of Transportation (CDOT).

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

Road attributes including number of lanes, surface type, roughness factor, etc. from the Colorado Department of Transportation (CDOT).

Highway segments and the various quality assurance data along with the overall grade, from the 2016 review of the Colorado Department of Transportation (CDOT).