It happened around 11 a.m. in the southbound lanes of I-476 in Radnor Township, just south of Exit 13.
Chopper 6 was above the scene where you can see a sedan became wedged under a Walmart tractor trailer.
Police say a female driver of the sedan was pulled out of the car.
She rushed to the hospital to be treated for a head injury.
There's no word of any other injuries.
Two lanes were briefly closed while police investigated, but reopened around noon.
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