Highway 400 was cluttered with damaged vehicles and subject to whiteout conditions Thursday after a series of collisions. OPP Sergeant Kerry Schmidt said blowing snow created dangerous driving conditions for motorists along a stretch of the highway. Northbound Highway 400 was shut down between Highway 88 and Innisfil Beach Road. By 3 p.m. however, all vehicles in the collisions had been removed from the highway and conditions had improved Schmidt told CP24. Vehicles were being towed to the Georgian Downs race track on the 5th sideroad of Innisfil Township.