The OPP were forced to close the westbound 401 in Mississauga early Monday.
Police say a tractor trailer rollover just west of Mavis blocked all lanes.
It happened around 1 a.m. but police aren’t sure how long the closure will last but it will likely affect the morning rush.
The driver of the truck was taken to hospital with minor injuries.
— OPP GTA Traffic (@OPP_GTATraffic) August 31, 2015