Later colonists called this route the Great Wagon Road; it became the major thoroughfare for immigrants' moving by wagons from Pennsylvania and northern Virginia into the backcountry of the South. The Valley Turnpike Company improved the road by paving it with macadam prior to the Civil War and set up toll gates to collect fees to pay for the improvements. After the advent of motor vehicles, the road was refined and paved appropriately for their use. In the 20th century, the road was acquired by the Commonwealth of Virginia, which incorporated it into the state highway system as U.S. Route 11. For much of its length, the newer Interstate 81, constructed in the 1960s, parallels the old Valley Pike.