PITTSBURGH (KDKA) – A tractor trailer lost its cargo on Route 51 South, causing a huge rush-hour traffic delay.

Allegheny County says a tractor trailer lost 15 to 20 sheets of steel on Saw Mill Run Boulevard/Wabash.

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The road has since reopened as officials cleaned up the steel that had spilled.
WATCH: NewsChopper 2 live over the scene —

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Some people tell KDKA they had been sitting in traffic for 45 minutes.

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Stay with KDKA.com for the latest on this developing story.