The Stone Mountain Expressway, also known as the Stone Mountain Freeway by the locals, connects Interstate 285 on the east side of Atlanta, Georgia with the suburbs of Stone Mountain, and Snellville, and continuting on to Athens. The freeway is signed as U.S. 78 its entire length, with about half also being Georgia state route 410 in the west, and the eastern half being Georgia state route 10. It begins at the U.S. 29/78 split and continues west, where it eventually becomes the Atlanta Highway (mentioned in "Love Shack" by The B-52's) near Athens. It is a divided highway with a median, and the speed limit is 55 MPH (88km/h) throughout. Unlike Georgia's Interstate highways, the highway still has actual exit numbers, rather than being mile-log.

Exits

United States Highway 78 / Georgia State Route 410

• Scott Boulevard / Decatur / Atlanta (no number)
• North Druid Hills Road / Valley Brook Road (exit 1)
• Interstate 285 / the Perimeter (exit 2 A/B)
• Brockett Road / Cooledge Road (exit 3)
• Mountain Industrial Boulevard / Tucker (exit 4)
• Memorial Drive / Stone Mountain Village / S.R. 10 West to East Ponce de Leon Avenue / Stone Mountain / Clarkston (exit 5)

United States Highway 78 / Georgia State Route 10

• Hugh Howell Road / Tucker / S.R. 236 North (exit 7)
• Stone Mountain Park Main Entrance / Jefferson Davis Drive (exit 8)
• West Park Place Boulevard (exit 9)
• Stone Mountain Highway / Snellville / Athens (no number)