At about 2:50 a.m. on Saturday, September 19, 2026, U.S. Park Police responded to a two‑vehicle collision on the northbound Baltimore‑Washington Parkway near Maryland Route 197. The crash caused one vehicle to roll over and ignited a fire, leading officers to shut down the northbound lanes of the parkway.
Four occupants from the involved vehicles were transported to local hospitals for treatment. Of those, three sustained injuries classified as life‑threatening, while the fourth suffered non‑life‑threatening injuries. Emergency crews worked to extinguish the fire and secure the scene before traffic could be rerouted.
The Baltimore‑Washington Parkway serves as a primary commuter route linking Baltimore and Washington, D.C., and the closure of the northbound lanes is expected to affect traffic flow in the region throughout the morning. Motorists were directed to alternate routes while investigators continue to examine the cause of the collision. U.S. Park Police have not released further details at this time.
Motorists traveling northbound encountered signage indicating the closure and were advised to use I‑95, I‑495 or MD‑32 as alternate paths. The sudden loss of a lane during pre‑rush hour prompted a temporary buildup of vehicles on nearby interchanges, according to traffic monitoring reports.
Authorities said the northbound lanes will remain closed until wreckage is cleared and the roadway is deemed safe for travel. The investigation will involve collision reconstruction and review of vehicle data, though no preliminary findings have been released.