A tractor trailer roll over has snarled traffic on West Bound I40 at mile marker 335.  The right lane and shoulder are blocked.  Traffic is already heavy around the Westel exit of I40 as drivers attempt to circumvent the accident by taking US Highway 70 to Crab Orchard.

Crews are expected to be on the scene most of the day as the truck is unloaded and then turned upright.  Drivers are urged to use caution and expect delays.