Three of the QEW's westbound lanes at Bronte Road in Oakville have reopened after a collision involving several vehicles closed them for several hours earlier Tuesday.

Four tractor-trailer units were involved in the crash at 11:10 a.m. One of the trucks jackknifed.

Four people suffered non-life-threatening injuries, police said.

Heavy tow trucks were called to the scene to remove the vehicles.

The cause of the crash is under investigation.