COBOURG, Ont. - The eastbound lanes of Highway 401 have reopened near Cobourg, Ont. after a tractor-trailer crashed off the roadway.

Video from Chopper24 shows the truck had disintegrated after smashing through a guardrail, down an embankment and into a gully.

The driver was airlifted to Sunnybrook hospital with serious injuries after being freed from the truck's cab.

Eastbound traffic is being diverted to Highway 2 south of the 401 along Lake Ontario.