It happened around 3 p.m. when Pennsylvania State Police say the driver of a tractor-trailer attempted to merge from a parked position on the westbound shoulder to the travel lane.
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That's when the driver was hit by a commercial tanker truck, which overturned in the median, spilling liquid asphalt near Mingo Road.
Chopper 6 over scene of truck crash on Route 422
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Authorities said the lanes had to be shut down for hazardous material cleanup. Emergency crews used sand to contain the spill.
The truck drivers were not seriously hurt.