Interstate 495 near exit 31 in Littleton, Massachusetts, was temporarily shut down on Thursday afternoon due to a serious motor vehicle crash.
According to Massachusetts State Police, all lanes both northbound and southbound were closed to allow a medical helicopter to land on the road.
The accident occurred around 2 p.m., and involved a tractor trailer and an SUV.
All lanes of travel were closed for about an hour before reopening around 3 p.m. Significant delays should still be expected.
There is no word on the number or extent of the injuries at this time.