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PITTSBURGH (KDKA) — There is now a big backup on I-79 South after a tractor-trailer rollover crash on Tuesday evening.

Traffic was down to just one lane near the Heidelberg exit.

Photo Credit: KDKA

That backup was compounded by the fact that after an earlier crash on the Parkway West, traffic was being detoured onto I-79.

Four vehicles were involved in a violent crash earlier on the Parkway West.

It happened on the inbound side of the road near the Carnegie exit.

Photo Credit: KDKA

The inbound lanes of the Parkway West were closed Tuesday at about 2:30 p.m. Traffic was being detoured onto the I-79 and the ramps from I-79 to eastbound I-376 are closed. That crash is now cleaned up and traffic is starting to clear.

One person was thrown through a windshield and died.