State Route 40 is a primary state highway in the southern part of the U.S. state of Virginia. It runs from SR 8 at Woolwine east to SR 10 at Spring Grove, about half the width of Virginia. It is the longest state-numbered route in Virginia.

State Route 8 is a primary state highway in the U.S. state of Virginia. The state highway runs 55.88 miles (89.93 km) from the North Carolina state line near Palmetto, where the highway continues south as North Carolina Highway 8, north to U.S. Route 11 in Christiansburg. SR 8 is part of a 151-mile (243 km) two-state highway 8 system and is the main north–south highway of Patrick County, Floyd County, and southern Montgomery County, connecting their respective county seats of Stuart, Floyd, and Christiansburg with each other and with the Blue Ridge Parkway. The state highway also links the New River Valley region of Virginia with Southside Virginia via US 58 and the Piedmont Triad of North Carolina via NC 8.