§ 340.190. Hand and Mechanical Signals.  


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  • A. 
    No person shall stop or suddenly decrease the speed of or turn a vehicle from a direct course or move right or left upon a roadway unless and until such movement can be made with reasonable safety and then only after the giving of an appropriate signal in the manner provided herein.
    1. 
    An operator or driver when stopping, or when checking the speed of the operator's vehicle, if the movement of other vehicles may reasonably be affected by such checking of speed, shall extend such operator's arm at an angle below horizontal so that the same may be seen in the rear of the operator's vehicle.
    2. 
    An operator or driver intending to turn the operator's vehicle to the right shall extend such operator's arm at an angle above horizontal so that the same may be seen in front of and in the rear of the operator's vehicle, and shall slow down and approach the intersecting highway as near as practicable to the right side of the highway along which such operator is proceeding before turning.
    3. 
    An operator or driver intending to turn the operator's vehicle to the left shall extend such operator's arm in a horizontal position so that the same may be seen in the rear of the vehicle, and shall slow down and approach the intersecting highway so that the left side of the vehicle shall be as near as practicable to the centerline of the highway along which the operator is proceeding before turning.
    4. 
    The signals herein required shall be given either by means of the hand and arm or by a signal light or signal device in good mechanical condition of a type approved by the State Highway Patrol; however, when a vehicle is so constructed or loaded that a hand and arm signal would not be visible both to the front and rear of such vehicle then such signals shall be given by such light or device.