The Arkansas Highway System is made up of all the highways designated as Interstates, U.S. Highways and State Highways in the US state of Arkansas. The system is maintained by the Arkansas State Highway and Transportation Department (AHTD). The system contains 16,442.90 miles (26,462.28 km) of Interstates, U.S. Routes, state highways, and bannered routes. The shortest members are unsigned state highways Arkansas Highway 806 and Arkansas Highway 885, both 0.09 miles (0.14 km) in length.