Colorado is a landlocked state, so ground and air transportation are the primary focus of the state. Also, due to low population density outside the Denver and Colorado Springs metropolitan areas, highways are the primary transportation method for most residents.
The main north–south route in Colorado is Interstate 25 (I-25). The I-25 corridor follows the front range of the Colorado Rockies and connects Denver, Colorado Springs, Pueblo, Fort Collins, Greeley, Trinidad, and other small cities. I-70 crosses Colorado from west to east and is a primary viaduct for tourists and locals to visit mountain communities. When it was completed, the section of I-70 passing through Glenwood Canyon was the most expensive section of Interstate Highway ever built in the United States with a total cost of $490 million for the 12-mile-long (19 km) stretch.[1]
Due to winter weather conditions, sections of I-70 are regularly closed during the winter and are expensive to maintain.
Colorado maintains state highways for high-volume travel routes that not part of the two national systems..
Safety
Colorado state welcome sign
In 2011, Colorado ranked among the five deadliest states for debris/litter–caused vehicle accidents per total number of registered vehicles and population size. Figures derived from the National Highway Traffic Safety Administration (NHTSA) show at least 16 persons in Colorado were killed each year in motor vehicle collisions with non-fixed objects, including debris, dumped litter, animals, and their carcasses.[citation needed]
In the United States, including Colorado, most civil aviation incidents are investigated by the National Transportation Safety Board (NTSB), as well as the Colorado Bureau of Investigation (CBI). When investigating an aviation disaster, NTSB investigators piece together evidence from the crash and determine the likely cause(s), whereas the CBI will also investigate if there is any involved criminal actions.
Denver International Airport handles the majority of air traffic in Colorado and is the fifth busiest airport in the world. Colorado Springs Airport also handles commercial flights and offers service to national destinations. The majority of other airports in the state handle on regional or private aviation needs.
Centennial Airport, located in Arapahoe County, is one of the busiest general aviation airports in the country and primarily handles private and corporate traffic.
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