A tractor-trailer overturned late Wednesday morning while merging onto Interstate 255 in Alorton.
The crash occurred shortly after 11:30 a.m. Wednesday. The truck was westbound on Illinois 15, merging onto southbound I-255 when it overturned on the ramp.
A man with a bandaged arm was seen walking and talking with emergency crews, but it was not clear if he was the driver.
A MedStar ambulance also was at the crash but left without a patient.
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The toppled tractor-trailer did not stop traffic.
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