Interstate 77 (I-77) is a major north-south United States highway that stretches approximately 320 miles from Charlotte, North Carolina to Cumberland, Maryland. It serves as part of the east-west Interstate Highway System, connecting several states and cities along its route.Initially constructed in the late 1950s and early 1960s, I-77 was expanded and improved over subsequent decades to accommodate increasing traffic demands. The highway passes through urban areas such as Greensboro, Winston-Salem, and Roanoke, and rural regions including West Virginia's Potomac Highlands.I-77 plays a crucial role in facilitating travel and commerce between the Midwest, Southern, and Northeastern United States. The highway is maintained by various state departments of transportation along its length, with periodic joint maintenance projects undertaken to ensure safety and efficiency.