CINCINNATI – Hours after an Ohio interstate overpass undergoing demolition collapsed, killing one person and injuring another, commuter traffic was slow around the Cincinnati region early Tuesday, particularly on other main arteries into the city.

Cincinnati Police Chief Jeff Blackwell late Monday urged commuters to plan ahead and said drivers should stay away from the collapsed overpass north of downtown Cincinnati and leave with plenty of time to get to work.

Authorities say a construction worker was killed and a tractor-trailer driver injured when the Interstate 75 overpass collapsed about 10:30 p.m. Monday.

Blackwell called it a workplace accident, saying crews were taking down an old bridge when something went “terribly wrong.”

The truck driver was taken to the University of Cincinnati Medical Center with minor injuries.

“The big-rig driver is very lucky; in a matter of seconds his fate would have probably been different,” Blackwell said.

Fire officials said the tractor-trailer struck the collapsed section as the bridge hit the ground. They said the construction worker was killed in the collapse. His name was not immediately released.

The Cincinnati Fire Department said the worker’s body was removed early Tuesday, after airbags were used to lift the wreckage.

Blackwell said the city will work with the Department of Transportation to figure out what happened. He said several hundred tons of concrete had to be removed from the road.

The southbound lanes of I-75 would be closed for at least 48 hours, officials said after the accident.

The collapse also caused buses that use I-75 and nearby streets to be rerouted.

A witness told WLWT-TV that he heard “a real big boom” and then a couple of seconds later he saw police cars rushing to the scene.