A police investigation has shut down all southbound lanes of Interstate 495 in Fairfax County, Virginia, causing major traffic disruptions Sunday afternoon. According to the Virginia Department of Transportation, the closure affects the I-495 outer loop between Gallows Road and Little River Turnpike, with traffic being detoured at Exit 50A onto Route 29/Route 50.

VDOT reported the incident just after 2:30 p.m., with traffic cameras showing vehicles at a standstill near Gallows Road. The backup extends for approximately four miles, creating significant delays for commuters. The closure follows a separate incident where a vehicle overturned in nearby Burtonsville, though it's unclear if these events are related.

This developing situation highlights the vulnerability of major transportation arteries to unexpected disruptions. The I-495 Capital Beltway serves as a critical transportation corridor for the Washington, D.C. metropolitan area, connecting Virginia and Maryland. Such closures can have ripple effects on regional commerce and daily commutes, particularly during peak travel times. Motorists are advised to seek alternative routes and monitor traffic updates as authorities work to clear the scene and reopen lanes.