A woman was struck by a vehicle on Route 50 overnight, according to police.

“At 2:30 am, an adult female attempted to cross Route 50, just prior to the on-ramp to Washington Boulevard, after darting out from the tree line,” said Arlington County Police spokesman Dustin Sternbeck. “The driver was unable to stop his vehicle in time and the pedestrian was struck. She remains in critical condition at GW Hospital.”

Several lanes of eastbound Route 50 were closed for an extended period of time while police investigated the accident. Those lanes had reopened by 5:30 a.m.