The driver of a vehicle involved in a rollover on Hwy. 403 near Burlington has been charged with several offences.
Police say a Honda Civic with four occupants was travelling westbound on Hwy. 403 east of Waterdown Road when it entered the ditch and rolled over.
The front seat passenger was ejected from the vehicle and suffered critical injuries, while the other three occupants suffered only minor injuries.
Witnesses told CityNews the driver was speeding, but police have not confirmed this separately.
Muhammad Siddiqui, 18, from Milton, faces three counts of dangerous operation of a motor vehicle causing bodily harm.
The investigation is still underway and anyone with information is being asked to contact police or Crime Stoppers.