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(NECN) - Members of the Massachusetts State Police are on the scene of a tractor trailer rollover on route 495 northbound in Marlborough at the bottom of the ramp from route 290 eastbound.
The driver of the tractor trailer was the only person inside the vehicle.
Injuries are unknown at this time.
All lanes of travel on route 495 northbound are closed to traffic at this time.
The Mass Department of Transportation (Mass DOT) is responding with arrow boards to help re-route traffic.
Traffic delays are expected.
This is a developing situation and more information will be released as it becomes available.