The two men who were thrown from their pickup truck after a crash on Highway 401 just east of Cambridge Tuesday morning were not wearing their seat belts, say the OPP.

The speed of their vehicle combined with the fact that the men weren't harnessed resulted in the two being ejected, said OPP Cambridge Detachment Commander John Mraud. The truck crashed into the concrete median that separates westbound and eastbound lanes, police said.

The pickup truck had been driving eastbound on Highway 401 near Wellington Road 35. At 8:55 a.m., the truck veered from the left lane to the right shoulder, said Mraud. The driver then over corrected, causing the truck to move over to the left shoulder, where it crashed into the centre median.

Mraud says there were no mechanical problems with the truck that would have caused it to suddenly veer to the right.

The 47-year-old driver from Maryhill was sent to Hamilton General Hospital and is in critical condition. His 30-year-old passenger from Kitchener was sent to Guelph General Hospital and is in stable condition.

Traffic was stopped on the eastbound lanes of Highway 401 for much of the morning as police investigated the scene.