Oxford OPP are warning motorists to slow down, especially on the less travelled roads. The 401 westbound lanes have been closed for a number of hours this morning following a jack-knifed tractor-trailer and Oxford Road 29 is now closed due to a crash. Police say Oxford Road 29, east of Innerkip is closed between Blandford Road and Oxford Road 22. Traffic is being rerouted around the closure. Police are asking motorist to slow down and drive according to the conditions, especially on the side roads and less travelled roads.