A jackknifed semi was causing delays on Interstate 55 Wednesday morning in suburban Bolingbrook.
No injuries were reported.
Around 3:40 a.m., state troopers responding to the northbound lanes of I-55 just south of I-355 for the semi that jackknifed across lanes and struck a median, Illinois state police said.
The median was partially pushed in the leftmost lane, state police said. Three lanes on the expressway were also closed.
Delays are expected and motorists are urged to seek an alternate route if possible, state police said.
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