A teenage girl was killed Wednesday night in a crash on Interstate 70, according to the Washington County coroner.

The accident happened at about 11:30 p.m. near the Beau Street exit in South Strabane Township.

Jessica Erin Neifert, 18, of Fredericktown, Pa., was driving her car in the eastbound lanes when she lost control, police said. The vehicle went off the road, through the median, over a hillside and onto the westbound lanes, where it struck a tractor-trailer, police said.

State troopers said Neifert's car went underneath the trailer. Investigators said the force of her car was so extreme that it broke the wheels off of the back of the trailer.

Neifert was pronounced dead at the scene.

The crash is being investigated by the state police.