One person was killed in a collision on the westbound 401 early Friday morning.
OPP confirm the fatality, saying a vehicle became wedged under a tanker truck near Highway 6 South, in Guelph.
The entire 401 was closed from Guelph Line to Highway 6 South, until about 5:30 a.m. The eastbound lanes re-opened at that time.
A third vehicle ended up in a ditch.