The Ontario Provincial Police is investigating a pair of crashes on Hwy. 401 that shut down the westbound lanes for hours.
The first crash, involving three vehicles, was just before 6 p.m. on Monday between Puce Road and Manning Road.
The second involved four vehicles just half an hour later.
Paramedics took one person from the second crash to the hospital as a precaution.
The westbound lanes reopened around 8 p.m.