KING TOWNSHIP, Ont. - Provincial police say the passenger in a vehicle involved in a single-vehicle collision on Highway 400 is facing charges.

Police say a car swerved and hit the cement centre guard rail on the highway south of Aurora Road.

There were two people in the vehicle at the time of the collision on Monday night.

Investigators say the passenger -- Robert Szylak, 31, of Oakville, Ont. -- is charged with impaired driving, failure to provide a breath sample and dangerous driving.

The 31-year-old driver, from Toronto, is charged with driving while under suspension.