Interstate 393 is a spur freeway taking traffic from Interstate 93 and the state capital of Concord to points east along U.S. 4 and 202. These two routes continue to Portsmouth and Rochester, respectively. The freeway bypasses Concord Municipal Airport (CON) and the commercialized corridor of NH 9 (former U.S. 4 & 202) to the north.
The designation of Interstate 393 was approved by AASHTO on July 13, 1976. The freeway initially ran east from the preexisting cloverleaf interchange between I-93 and the U.S. 3-4-202 connector to New Hampshire 9 (Loudon Road) in August 1981.1 The route was proposed to extend east from Concord to the Spaulding Turnpike in 1983, but that extension was dropped in favor of upgrading New Hampshire 101 to a full freeway between I-93 and I-95.2 That left construction of the eastern leg of I-393 beyond NH 106, which opened in December 1988.3