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.
Features in this dataset represent traffic counts on public roads under local jurisdiction that are functionally classified as arterials or collectors. Features are represented by polyline (linear) geographic shapes from the Colorado Department of Transportation (CDOT), for 2014
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.
CDOT’s maintenance program establishes a target letter grade it expects to achieve for snow and ice control each year. During the winter, CDOT maintenance workers complete surveys to grade their performance using established criteria based on the year’s budget. Higher grades are typically achieved during lower-cost, milder winters.
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.