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).

COTrip.org has a real-time travel data feed provided by Intelligent Transportation Systems (ITS), a division of CDOT, for data including Incidents, Weather Stations, etc.
You can access the feed here:
https://manage-api.cotrip.org/
For further information or assistance, please visit the following link:
https://maps.cotrip.org/help/section/for-developers.html

Links and feeds for live traffic around Colorado, from the Colorado Department of Transportation: COTRIP Online Transportation Information System. Information is provided on current and projected traffic volumes, state highway attributes, summary roadway statistics, demographics and geographic data. This is the access point to information frequently used for transportation planning and project development.

Expenses for Colorado Department of Transportation for the current and previous state fiscal year.

Route locations, segment lengths and route identifiers, from the Colorado Department of Transportation (CDOT).

Number of traffic fatalities each year on Colorado roads

Revenues for Colorado Department of Transportation for the current and previous state fiscal year.

High Occupancy Vehicle and restricted driving lanes in the state of Colorado from the Colorado Department of Transportation (CDOT).

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

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