Police are trying to figure out why a semi crashed into several other vehicles.
ISP said the crash happened at about 7:55 a.m.
All northbound lanes of I-57 were blocked at 9 a.m. near Halsted Street, ISP said.
By 9:40 a.m. all lanes reopened, ISP said.
Police said no one was hurt, but the fire department said it did transport four people from the scene.
CHICAGO TRAFFIC See LIVE drive times