A motorcyclist has been critically injured in a collision on the Queen Elizabeth Way in Oakville, police say.
It occurred on the westbound lanes of the highway before Dorval Drive and involved a motorcycle and a light-coloured passenger van.
Police said the motorcyclist was taken to a trauma centre with life-threatening, potentially life-altering, injuries.
Meanwhile, the driver of the van did not stop, police said. No further descriptions of the van have been released.
The cause of the collision is unknown.
The two left lanes of the highway were for several hours for the investigation.
This was the second collision on the highway on Tuesday. During the afternoon rush hour, five vehicles were involved in a crash on the Toronto-bound lanes near Third Line.
A driver was taken to the hospital with serious injuries.
The cause of this crash is under investigation. Police said charges were pending.