CINCINNATI (AP) — A Cincinnati highway is open again to traffic as an investigation continues into the deadly overpass accident that killed a worker and injured a truck driver.

The removal of tons of debris from Interstate 75 began Tuesday afternoon and was completed by nighttime, allowing the closed southbound lanes to reopen to traffic. The state Department of Transportation says minor repairs were made.

Transportation officials said heavy equipment was being used to separate a concrete deck from structural steel when the span fell Monday night.

Police say casualties could have been much higher had the late-night collapse happened at a busy time on the interstate, which carries more than 178,000 vehicles a day through the area 5 miles north of the Ohio River.

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