All four lanes on Highway 400 just south of Highway 88 near Bradford are closed after a four-car collision.
Ontario Provincial Police Constable Dave Woodford says a Ford Windstar and Pontiac Sunfire collided in two lanes which led the Sunfire to spin into the guardrail and a tractor trailer at about 4.30 p.m.
The tractor trailer went into the ditch and debris from the truck hit another car.
Woodford says there were minor injuries but no one wanted to go to hospital.
All northbound lanes on Highway 400 are currently closed but two lanes will reopen in about an hour.
Traffic on northbound 400 from Aurora Road to King Road has been backed up due to the crash.
Police say there has been extensive guard rail damage and it will be hours before all lanes reopen.
