The vast majority of roads in the United States are freeways, in the true sense of the word, no direct fee for use is charged for traveling those roads. Only a very small number of toll roads exist in the United States, as of 2008. That number will likely grow if the trend towards the privatizing of previously public activities continues.

Geographic reference: United States
Year: 2008
Market size: 4,919.6 miles
Source: “Table 1-3: Toll Roads, Toll Bridges and Tunnels, and Toll Ferry Routes: 2008,” State Transportation Statistics 2009, page A-3.
Original source: Research and Innovation Technology Administration, Bureau of Transportation Statistics, U.S. Department of Transportation