Section 55-8-142 - Turning movements - Signal for stop or decrease in speed(a) No person shall turn a vehicle at an intersection unless the vehicle is in proper position upon the roadway as required in § 55-8-140, or turn a vehicle to enter a private road or driveway, or otherwise turn a vehicle from a direct course or move right or left upon a roadway, unless and until this movement can be made with reasonable safety. No person shall so turn any vehicle without giving an appropriate signal in the manner provided in §§ 55-8-143 and 55-8-144 in the event any other traffic may be affected by this movement.(b) No person shall stop or suddenly decrease the speed of a vehicle without first giving an appropriate signal in the manner provided herein to the driver of any vehicle immediately to the rear when there is opportunity to give this signal.Acts 1955, ch. 329, § 42; T.C.A., § 59-842.