The initial crash happened about 1:55 a.m. near 43rd Street, Illinois State Police said.
All local lanes are now open on the inbound Dan Ryan Expressway after 11 vehicles were involved in a series of crashes near 43rd Street.
The initial crash happened about 1:55 a.m. and involved four semi-trucks and three cars, according to Illinois State Police. The pileup caused several more crashes in the area, bringing the total amount of vehicles involved to 11, including six semi-trucks.
Three people in total were treated for minor injuries, state police said.
Local lanes reopened just before 6 a.m., state police said. The inbound entrance ramp at 43rd Street, however, is closed until further notice.