Highway 401 is closed in both directions and has detours in place between Exit 730 at Cardinal and exit 721(b) in Johnstown while investigation continues into a single vehicle accident. Last night a tractor trailer was travelling and while attempting to avoid a deer the trailers flipped onto their sides. The truck stayed upright however the two trailers were carrying petroleum. The Ministry of Environment, Transportation, Edwardsburgh/Cardinal Fire and Drain All remain on scene. The highway is expected to reopen later this afternoon.