Overturned tractor trailer leaking liquid asphalt causes major delays on 495 in Montgomery County

An overturned tractor trailer caused major delays Thursday morning after leaking liquid asphalt on a portion of Interstate 495 in Montgomery County.

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Pete Piringer / @mcfrsPIO

The incident happened on the outer loop of the Beltway near the Rockville Pike overpass just past the Interstate-270 north exit.

Hazmat units responded to the scene. Commuters can expect closures and major delays in the area into the afternoon. The driver of the tractor trailer has been hospitalized.

The cause of the crash is still being investigated.