MERCER CO., Pa. (WKBN) – Interstate 80 in Mercer County has reopened following a multi-vehicle crash involving several semis Tuesday afternoon. Drivers who were on the road when it happened were stuck in traffic hours later.

As of just after 11 p.m., the left westbound lane of I-80 is finally moving again. By 2 a.m. Wednesday all lanes were clear.

Ten to 12 vehicles crashed in the westbound lanes just past West Middlesex around 3:30 p.m.

Four people are in moderate to critical condition and one person has injuries that are not life-threatening. Several others were hurt but were able to walk around.

Emergency crews said multiple people were trapped in their cars.

The crash also caused fuel to be spilled on the road.

I-80 westbound was closed from Exit 15 (Route 19, Mercer) to Exit 4 (Route 760/Route 18, Sharon) as crews cleaned up the crash.

The Pennsylvania Department of Transportation worked to make a path for cars stuck on the road to pass through.

The speed limit on I-80 was reduced to 45 mph from the Ohio state line to Exit 19 (Interstate 79 interchange).

The eastbound lanes were also at a standstill for a while but started moving again around 7 p.m. Tuesday.