American Association of State Highway and Transportation Officials

The American Association of State Highway and Transportation Officials (AASHTO) is a nonprofit, nonpartisan association that represents the member highway and transportation departments in the 50 states, the District of Columbia, and Puerto Rico. It is the only association that represents all five transportation modes - air, highways, public transportation, rail, and water. Its purpose is to foster the development, operation, and maintenance of an integrated national transportation system.