Highway 400 south of Barrie has reopened in both directions, 10 hours after closing due to a multi vehicle crash.
The crash happened before noon and shut down the northbound and southbound 400 north of Highway 89.
There was a collision involving two vehicles in the southbound lanes and the vehicles were struck by a transport truck that couldn't stop in time.
The truck then hit a cube van, which veered into the northbound lanes and struck two other vehicles.
One person was seriously injured.