Traffic counts on highways and various calculations, from Colorado Department of Transportation (CDOT), for 2017

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

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.

Road curvature and gradient data in sections across Colorado, from the Colorado Department of Transportation (CDOT), since 2000. Contains roadway sections and various data about them: road width, thickness, curvature, grade, speed limits, signals, etc.

Colorado Highway and Frontage road milepost locations. Mileposts are locations of milepost (mile marker) locations alongside CDOT highways, collected during GPS mapping efforts in the early 2000s. MIleposts differ from milepoints in that milepoints represent the location along CDOT highways where that highway's linear reference system indicates a whole number reference point (such as 57.000). Therefore, mileposts are not necessarily found at exactly at milepoints. Also includes collection date of point, route ID and some GPS locations.

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.

Rapid Transit System, Roadway Networks, Crash Data, Regional Roadway System, Traffic Analysis Data, Railroads, Bicycle Corridors, and more. This data can be searched by keyword or browsed by subject and are available in a variety of formats, including KML, WMS, GeoRSS, and Shapefile.

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.

Traffic counts on highways and various calculations, from Colorado Department of Transportation (CDOT), for 2017