Police closed the center and left southbound lanes after the crash at around 3:45 p.m. near Mile Marker 7, just north of the Glebe Road exit. Cars could still get by slowly in the two right-hand lanes.
Backups were already reaching as far north as the Pentagon just after 4 p.m. Drivers in the area should expect delays.
Update: Accident: SB on I-395 at MM7 in Arlington Co. 2 travel lanes closed. Potential Delays.4:04PM
— 511 Northern VA (@511northernva) October 31, 2017
Crash. I-395 SB before VA-120 (Ex 7). Arl Co, VA. 2 left lanes blocked, 2 right lanes get by. Delays appx 2 miles.
— MATOC Alerts (@MATOC) October 31, 2017