2005 California Vehicle Code Sections 25350-25352 Article 9. Commercial and Common Carrier Vehicles

25350.  Any passenger common carrier motor vehicle manufactured
prior to January 1, 1968, may be equipped with green identification
lamps.  Any bus may be equipped with an illuminated termini sign, an
illuminated identification sign, or any combination thereof, which
shall not project any glaring light.  Internally illuminated termini
signs, identification signs, or any combination thereof, meeting the
requirements of Section 25400 may be mounted inside a bus.  Any
commercial vehicle, other than a passenger common carrier motor
vehicle, may be equipped with an illuminated identification sign upon
the front thereof which shall not exceed 24 inches in length or 8
inches in width and which emits diffused white light without glare.
25351.  (a) A commercial vehicle and, except as provided in
subdivision (d), any other vehicle 80 or more inches in width may be
equipped with identification lamps mounted on the front or rear.  No
part of any such lamps or their mountings on the front of a motor
vehicle shall extend below the top of the windshield.
   (b) Identification lamps on such vehicles manufactured prior to
January 1, 1968, may exhibit either amber, green, or white light to
the front and red light to the rear.
   (c) Identification lamps on such vehicles manufactured on or after
January 1, 1968, may exhibit only amber light to the front and red
light to the rear.
   (d) Identification lamps are not permitted on passenger vehicles,
except housecars and ambulances, regardless of width.
25352.  Any bus operated by a publicly owned transit system on
regularly scheduled service may be equipped with a device capable of
sending a signal that interrupts or changes the sequence patterns of
an official traffic control signal, under the following conditions:
   (a) If such a device is a flashing gaseous discharge lamp, such
lamp shall not emit a visible light exceeding an average of 0.0003
candela per flash of any color measured at a distance of 10 feet.
   (b) Such device shall not be installed or used unless and until
authorized on specific routes by either the Department of
Transportation pursuant to Section 21350 or local authorities
pursuant to Section 21351.
   (c) Any bus or system operating under the conditions specified
herein shall allow emergency vehicles operating pursuant to Section
25258 or 21055 to have priority in changing the sequence patterns of
an official traffic control signal.