The westbound lanes of Hwy. 401 are fully reopened near Hwy. 3 after a single-vehicle collision.
The OPP say a tractor trailer left the roadway and landed in a ditch off Hwy. 401 around 7am Sunday.
The cleanup blocked the centre and right lane of the highway for most of Sunday morning, but the area has since been cleared.
Tecumseh police officers were also on scene and say the driver of the tractor trailer sustained minor injuries.