UPDATE 9:55a.m. (WSLS 10) - Both northbound lanes on I-81 in Montgomery County are now open and the detour has been removed.
VDOT says congestion is gradually clearing.
Police say the crash happened at about 1:30 a.m. on Tuesday morning, at the 121.1 mile marker of I-81 northbound. and was blocking the roadway.
A tractor-trailer appears to have blown a tire while traveling in a work zone and hit a work vehicle then caught fire.
Police say there were two injuries and a medevac helicopter was used transport both of the truck's diver and the state worker to the hospital.
Crews continue working to clear the roadway of debris.
MONTGOMERY COUNTY (WSLS 10) - There is an accident on I-81 North causing serious backups.
On I-81 at mile marker 121.1 in Montgomery County, motorists can expect major delays due to a vehicle fire.
All north lanes are closed and according to VDOT, traffic backups are about three miles.
All northbound traffic is being detoured at Exit 118.
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