It happened before 6:30 a.m. Tuesday on the ramp from I-476 North to I-76 West.
The driver lost control, and the big rig landed on its side.
Police tell Action News the trailer was empty. There was no immediate word if the driver was hurt.
Video from Chopper 6 HD showed traffic getting by on the ramp as police investigated.
Traffic was backed up on I-476 North approaching the I-76 exit.
The truck was finally cleared and traffic flowing normally again by 11 a.m.
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