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Our Nation's Highways: 2008

Figure 2-3. Interstate Annual Average Daily Traffic, 2006

The most widely used parameter of measuring traffic activity on a highway or highway segment is annual average daily traffic (AADT). AADT can also be used to assess how serious congestion is by comparing the highway’s capacity with AADT at peak times and directions. These calculations help transportation agencies decide whether highway infrastructure is adequate to the demand.

See paragraph above for explanation of this figure.

Data Source: U.S. Department of Transportation, Federal Highway Administration, Office of Highway Policy Information, Highway Performance Monitoring System.

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Tianjia Tang
Office of Highway Policy Information
E-mail Tianjia


United States Department of Transportation - Federal Highway Administration