Updated at 5:43 p.m.
The George Washington Parkway is open again, but it is clogged for 4.5 miles north of Interstate 395 in Arlington.
FINAL: Vehicle Crash. GW Pkwy SB prior to I-395, Arl Co, VA. All travel lanes are now open. Delays remain, approximately 4.5 miles.
— MATOC Alerts (@MATOC) August 12, 2014
All southbound lanes were closed earlier after an accident.