A 40-year-old woman from Cambridge was killed Saturday in a collision on Highway 401 in Halton.
Provincial police say the woman was driving eastbound with her six-year-old daughter when she struck the guard rail near James Snow Parkway. Her vehicle was then struck by a pickup truck that was occupied by four people.
The woman was pronounced dead at the scene and her daughter was taken to a hospital with minor injuries.
None of the people in the pickup truck were injured.
Police say the eastbound express lanes are closed for an investigation.