Delays of 15-20 minutes were reported by 511nj.org as of 5:30 p.m.
The truck overturned around 4 p.m. at exit 41, state police said. The ramp and two right lanes of Route 80 westbound were closed following the crash, 511nj.org reports.
State police urged commuters to seek alternate routes.
Drivers reported delays as far as Morristown.
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