In this report, TRIP looks at the history and benefits of the Interstate Highway System, its current use and condition, and the future needs of the nation’s most critical transportation system. Sources of data for the report include the U.S. Department of Transportation (USDOT), the Federal Highway Administration (FHWA), the National Highway Traffic Safety Administration (NHTSA), and the U.S. Census Bureau. State-by-state Interstate data can be found in the Appendix. The major findings of the report include the following