A crash Tuesday afternoon on westbound Interstate 80 near Wheeler Avenue in Joliet appeared to block all lanes of traffic.
Several large vehicles appeared to be off the roadway about 1 p.m. Tuesday. Emergency personnel, including police, firefighters and paramedics were responding.
Traffic backed up past Briggs Street to the east, and eastbound traffic slowed just east of Houbolt Road.
Illinois State Police did not respond to requests for more information.