Editor's note: The lanes were reopened as of 8:45 a.m. Our latest story can be found here. Our original story continues below.

Entry and exit lanes on the Eisenhower Expressway (I-290) were closed early Monday morning and significant delays were expected after a pedestrian was struck and killed in the roadway overnight, Illinois State Police said.

NBC 5's Lisa Chavarria said the accident, which involved an SUV and a pedestrian, occurred around 4:20 a.m. According to ISP, the pedestrian, an adult male, was struck and killed “on the roadway” in the exit lanes. After being struck, the pedestrian was sent to the entrance lane, officials said.

As of 5 a.m., the ISP said traffic was being diverted in both directions and major traffic jams were occurring. Traffic in the outbound lanes was rerouted at 9th Avenue, the ISP said, while traffic in the inbound lanes was rerouted at 25th Avenue.

By 5:30 a.m., travel time on I-290 was more than 75 minutes, Chavarria reported, with traffic backed up “well past Wolf Road.” On the outward journey the journey times were up to 90 minutes.

As the morning progressed, these travel times increased.

“If this is your route, do not take the Eisenhower Expressway,” Chavarria warned.

According to ISP, both the entrance and exit lanes of I-290 may remain closed during the morning commute as the investigation continues.

At 6:45 a.m., photos and videos from the scene showed a heavy traffic jam with several state vehicles on the highway and a heavily damaged SUV with a broken windshield and a badly dented hood.

This is a developing news story and will be updated as more information becomes available.