Backups were as long as four miles.
A crash involving multiple vehicles is causing all lanes on the southbound side of I-270 to close in Frederick County.
The driver was seriously injured, a spokesman said.
Part of roadway closed earlier because of four-car crash. Miles of delays.
Crash closes southbound lanes of I-270. Incident in Gaithersburg causing three mile backup.
A woman gave birth in her car on the left shoulder of I-270.
An accident on Interstate 270 temporarily blocked the road in both directions just south of Frederick, creating heavy delays on Friday afternoon.
Drivers in Montgomery County are urged to avoid southbound I-270 in Gaithersburg following a crash.
The main southbound lanes are closed at the Shady Grove exit due to an accident this morning.
One lane of the outer loop is closed this morning after a tractor-trailer overturned near the I-270 split in Montgomery County.