Crash closes southbound lanes of I-270. Incident in Gaithersburg causing three mile backup.
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.