(A)   The driver of any vehicle upon a highway or street before starting, stepping or turning from a direct line shall first see that such movement can be made in safety and if any pedestrian may be affected by such movement shall give a clearly audible signal by sounding the horn, and whenever the operation of any other vehicle may be affected by such movement shall give a signal as required in this section plainly visible to the driver of such other vehicle of the intention to make such movement.
   (B)   The signal herein required shall be given either by means of the hand and arm in the manner herein specified, or by an approved mechanical or electrical signal device such as signal lamp or lamps, except that when a vehicle is so constructed or loaded as to prevent the hand and arm signal from being visible both to the front and rear, then said signals must be given by such a lamp or lamps or signal device.
   (C)   Whenever the signal is given by means of the hand and arm, the driver shall indicate his or her intention to start, stop or turn by extending the hand and arm from the left side of the vehicle in the following manner and such signals shall indicate as follows:
      (1)   Left turn. Hand and arm extended horizontally;
      (2)   Right turn. Hand and arm extended upward; and
      (3)   Stop or decrease speed. Hand and arm extended downward.
(Prior Code, § 6-6-1)