OPP are seeking witnesses to a single-vehicle crash early Friday on Highway 40 that sent three people to hospital.
At approximately 6:45 a.m., police, fire and EMS responded to the highway near Bush Line, in Dover Centre. The vehicle had left the roadway before coming to rest in the ditch, police said.
One occupant suffered life-threatening injuries, with two people receiving minor injuries, police said.
Members of the OPP traffic incident management and enforcement unit are assisting Chatham-Kent OPP with the investigation.
Investigators ask anyone who may have witnessed the crash to call 1-888-310-1122.