A man has been seriously injured in a two-vehicle collision on Highway 401 in Mississauga Wednesday afternoon.

Ontario Provincial Police said a black Dodge pickup truck collided with an MTO crash truck on the westbound express lanes of the highway, just east of Mavis Road.

One person was transported to a local hospital in serious but stable condition, Peel paramedics said.

The cause of the collision is unknown.

OPP have closed the westbound express lanes of Highway 401 at Hurontario Street.