RELOCATION OF REAR TURN SIGNALS

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California has an administrative code, in addition to vehicle code (and penal code and health & welfare code, etc.)

Title 13, Division 2, Chapter 2, Article 7 is excerpted below.

§ 699. Turn Signal Lamps.
Turn signal lamps shall be mounted and operated as follows:

(a) ...Front and rear turn signal lamps on motorcycles shall be at least 23 cm (9 in.) apart, except that front turn signals on motorcycles manufactured after January 1, 1973, shall be at least 40 cm (16 in.) apart. Turn signal lamps on other vehicles shall be spaced as far apart as practical. The optical axis of the front turn signal lamp shall be at least 10 cm (4 in.), or as specified by FMVSS 108 in effect at the time of vehicle manufacture, from the inside diameter of the retaining ring of the lower beam headlamp unit, fog lamp unit or passing lamp unit. Additional turn signal lamps may be mounted closer than the 10 cm (4 in.) dimension provided the primary lamps equal or exceed that distance. Original equipment turn signals that emit two and one-half times the minimum candela requirements may be closer.

© Operation. Turn signal lamps visible to approaching or following drivers shall flash in unison, except that a turn signal consisting of two or more units mounted horizontally may flash in sequence from inboard to outboard. The lamps may be either extinguished simultaneously or lighted simultaneously. Turn signal lamps shall flash at a rate of 60 to 120 flashes per minute.

(d) Pilot Indicator. An effective visual signal operating at the same rate as the turn signal flasher shall be incorporated in the circuit to give clear and unmistakable indication to the driver that the turn signal lamps are turned on. Failure of one or more turn signals to operate shall be indicated by a steady-on, steady-off, or significant change in the flashing rate of the illuminated indicator, except on combinations of vehicles using a variable load flasher.

(f) Mounting Height. Required turn signal lamps shall be mounted at a height not less than 38 cm (15 in.) nor higher than 2.1 m (83 in.).

Flashing faster than two per second may be inviting a traffic stop.