County Line Fire with Cool Springs Engine 2 and Squad 1 responded to I-40 for traffic accident with tractor trailer involved. County Line Fire arrived on scene and shortly after Cool Springs Engine 2 and Squad 1. Once on scene they found that a SUV had hit the flat bed tractor trailer from behind. Engine 2 crew checked on patients, checked for fire hazards, and controlled fluid leaks. The interstate was shut down to one lane at the time. Once the vehicles were moved from the roadway the interstate was opened back up to all lanes and Cool Springs units cleared.