LITTLETON, MASS. (WHDH) - An overturned truck is causing traffic delays in Littleton on Tuesday morning.

A tractor-trailer hauling gravel rolled over and dumped its load on the Exit 79 ramp from Route 2A to Interstate 495 south, according to the Littleton Police Department.

The ramp has been closed and motorists are being urged to avoid the area until further notice.

MassDOT says it could take “several” hours to clear the mess.

The cause of the crash remains under investigation.

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