If you approach a vehicle with a reflective triangular orange sign on its rear, you must

A reflective triangular orange emblem on the rear of a vehicle identifies it as a low-speed or slow-moving vehicle, which Tennessee law defines as a vehicle (other than a golf cart) whose top speed is greater than 20 mph but not greater than 25 mph. Slow-moving vehicles include farm tractors and roadway maintenance vehicles. If you approach one of these vehicles, slow down and proceed with caution. Be patient; the driver may pull over to let you pass. [TCA § 55-1-122]