Any stop or turn signal when required by the traffic code shall be given either by means of the hand and arm or by mechanical device, all of which signals shall be plainly visible and understandable in normal sunlight and at night from a distance of 100 feet to the front and rear, but shall not project a glaring or dazzling light; except that a stop signal need be visible only from the rear. All mechanical signal devices shall be self- illuminated at all times when in use.
(Added Coun. J. 7-12-90, p. 18634)