<P> Skyline Drive is a 105 - mile (169 km) road that runs the entire length of the National Park Service's Shenandoah National Park in the Blue Ridge Mountains of Virginia, generally along the ridge of the mountains . The drive's northern terminus is at an intersection with U.S. Route 340 (US 340) near Front Royal, and the southern terminus is at an interchange with US 250 near Interstate 64 (I - 64) in Rockfish Gap, where the road continues south as the Blue Ridge Parkway . The road has intermediate interchanges with US 211 in Thornton Gap and US 33 in Swift Run Gap . </P> <P> A park entrance fee is charged at the four access points to the drive . Skyline Drive is a two - lane road that has 75 overlooks providing views of the Shenandoah Valley to the west and the Piedmont to the east . The drive provides access to numerous trails, including the Appalachian Trail, and it is also used for biking and horseback riding . Skyline Drive is the main road through Shenandoah National Park and has access to campgrounds, visitor centers, and resorts such as Skyland Resort and Big Meadows . The scenic drive is particularly popular in the fall for leaf peeping when the leaves are changing colors . Skyline Drive is designated a National Scenic Byway and a National Historic Landmark and is listed on the National Register of Historic Places . </P> <P> Plans for the road date back to 1924 when a national park was planned in the Blue Ridge Mountains of Virginia and the main feature was to be a "sky - line drive" providing views of the surrounding land . President Herbert Hoover, who had a summer home at Rapidan Camp, called for the construction of the road . Groundbreaking for Skyline Drive took place in 1931 . The first section, which originally was to run from Rapidan Camp to Skyland, was extended between Swift Run Gap and Thornton Gap and opened in 1934 . Skyline Drive was extended north to Front Royal in 1936 and south to Jarman Gap in 1939 . The road between Jarman Gap and Rockfish Gap was built as part of the Blue Ridge Parkway in 1939 and was incorporated into Skyline Drive in 1961 . The Civilian Conservation Corps played a large part in constructing Skyline Drive . Improvements have been made to the roadway since it was built . Skyline Drive was added to the National Register of Historic Places in 1997, became a National Scenic Byway in 2005, and was designated a National Historic Landmark in 2008 . </P> <P> Skyline Drive takes a winding north--south path along the mountaintops of the Blue Ridge Mountains east of the Shenandoah River from Front Royal to Rockfish Gap, serving as the only public road through Shenandoah National Park . There are four entrance points to Skyline Drive located at US 340 near I - 66 in Front Royal, US 211 in Thornton Gap, US 33 in Swift Run Gap and US 250 near I - 64 in Rockfish Gap . At the south end in Rockfish Gap it connects to the northern terminus of the Blue Ridge Parkway, a free - access road that continues southward along the Blue Ridge Mountains . On the west side of the drive, mileposts are present . They are numbered from 0 to 105 (north to south) and serve as reference points to directions in the drive . There are 75 overlooks throughout the drive, providing views of the Shenandoah Valley to the west and the Piedmont to the east . </P>

What is the route number for skyline drive