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Interstate 68 is a 112.9-mile (181.7 km) Interstate highway in the U.S. states of West Virginia and Maryland, connecting Interstate 79 in Morgantown to Interstate 70 in Hancock, and is also part of the Appalachian Development Highway System. In Maryland, it parallels the historic National Road between Keysers Ridge and Hancock. A road cut at one of the many mountain ridges it crosses, Sideling Hill, exposes geological features that have become a tourist attraction. From 1965 until the freeway's construction was completed on August 2, 1991, its segments were designated as U.S. Route 48. It crosses Allegany, Garrett, and Washington counties in Maryland, and Preston and Monongalia counties in West Virginia. The two largest cities connected by the highway are Morgantown and Cumberland, Maryland. Although the freeway serves no major metropolitan areas, it connects western Maryland and northern West Virginia and provides an alternative to the Pennsylvania Turnpike for westbound traffic from Washington, D.C. and Baltimore. US 219, US 220 and US 40 overlap in part with I-68. (Full article...)