The 401 westbound was closed for several hours in the Lansdowne area after a serious multi-vehicle crash on Friday afternoon sent multiple people to hospital.
OPP say that one person was airlifted by ORNGE helicopter with serious injuries. Several others involved in the 3-vehicle crash sustained less serious injuries and were transported by land ambulance.
For a time after the crash, both directions of the 401 were stopped as first responders were dispatched to the scene. The eastbound lanes reopened shortly thereafter.
Westbound lanes were closed for the collision investigation until approximately 1:30 a.m. the next day.