South Australian Consolidated Regulations South Australian Consolidated Regulations99—Performance and operation of brake lights
(1) When on, a brake
light must show a red light visible 30 metres from the rear of the vehicle.
(2) A brake light
fitted to a street rod vehicle may incorporate a blue lens not over
20 millimetres in diameter.
(3) A brake light
fitted to a motor vehicle must come on, if it is not already on, when:
(a) for
a vehicle with 4 or more wheels or built after 1974—a service brake is
applied; or
(b) for
another vehicle—the rear wheel brake is applied.
(4) Subrule (3) does
not apply if the controls in the vehicle that start the engine are in a
position that makes it impossible for the engine to operate.
(5) A brake light on a
trailer must come on when:
(a) the
brake light of the towing vehicle comes on; or
(b) a
brake control on the towing vehicle, which independently activates the service
brake on the trailer, is operated.
(6) A brake light may
be operated by an engine brake, retarder, or similar device if the device does
not interfere with the proper operation of the brake light.
(7) A street rod
vehicle is a vehicle that has been modified for safe road use and that:
(a) has
a body and frame that were built before 1949; or
(b) is a
replica of a vehicle the body and frame of which were built before 1949.