It happened just after 8:30 a.m. Tuesday at Mile Marker 337, near the Belmont Avenue exit, and created major delays for the morning rush.
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Traffic was at a standstill between Conshohocken and Belmont Avenue.
An ambulance had to back up in the wrong direction to get out of the backlog.
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There were restrictions on the westbound Schuylkill Expressway, as well.
No injuries have been reported.