American Association of State Highway & Transportation Officials

 

Colorado Department of Transportation (CDOT)

 

Federal Highway Administration (FHWA)

 

Institute of Transportation Engineers

    Traffic Calming: State of the Practice

    Manual includes history, terms, real life studies, impacts and more.

 

Manual on Uniform Traffic Control Devices

 

USGS Water Resources of Colorado

Includes online current and historical water information, including real-time surface water conditions, ground water, water-quality.