The westbound lanes of Highway 401 are closed at Highway 49 Marysville following a collision Friday afternoon.
Emergency crews are on scene.
The collision occurred around 4:30 on the westbound 401 between Marysville and Shannonville.
A detour is set up via Highway 2.
OPP estimate the time of closure to be about two hours (as per 4:49 p.m. Tweet).
Police have not said how many vehicles may have been involved or if there are any injuries.
