Illinois State Police said the crash occurred about 3 a.m. on outbound Interstate 90 at Lawrence Avenue in the city's Jefferson Park neighborhood.
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State police said a semitrailer and three vehicles crashed, and there was a Level 1 hazmat issue for a diesel spill.
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Both sides of the Kennedy were shut down in the area, while emergency crews responded.
The Chicago Fire Department said the roadway reopened about 4:45 a.m.
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ABC7 Chicago cameras captured the truck moving slowly out of the area, and a placard that said "explosives" on the back of the vehicle.
Blue Line service was temporarily suspended between Jefferson Park and Montrose due to the situation.
It resumed with delays just after 4:30 a.m.
No one was injured in the incident.