BENSON — State troopers and the state Department of Transportation said they expected it may be noon Friday before congestion finally smoothed out on southbound Interstate 95 following a lane closure overnight near mile marker 84.

The highway was interrupted after a tractor-trailer overturned about 10:30 p.m. Thursday. That may have been due to a cow on the interstate, which apparently stemmed from an earlier incident involving a smaller truck hauling a trailer with animals in it.

“It’s all open,” a Highway Patrol dispatcher said about 6 a.m. Friday, but added, “It was closed all night,” and backups were expected to take several hours to ease.

The DOT’s traffic website had an estimate that congestion could last until noon.