One person is dead after a car going the wrong way on the Route 30 bypass in Chester County slammed head on into a tractor trailer.

The accident closed the eastbound lanes of the highway between the exits for Route 322 and Route 113 through the night and into the morning rush hour.

The crash occurred about 11 p.m. Wednesday and the eastbound lanes did not reopen until 8:30 a.m.

State police are investigating.