Road Traffic (Light Vehicle Standards) Rules 2018
Div 10Brake lights
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Division 10—Brake lights 94—Fitting brake lights (1) A brake light must be fitted to the rear of a vehicle built after 1934. (2) A pair of brake lights must be fitted to the rear of— (a) a motor vehicle built after 1959 that has 4 or more wheels; and (b) a motor trike built after 1959 that has 2 rear wheels; and (c) a trailer built after June 1973. (3) The centre of a brake light must be— (a) at least 350 millimetres above ground level; and (b) not over— (i) 1.5 metres above ground level; or (ii) if it is not practicable to fit the light lower—2.1 metres above ground level. (4) A vehicle may be fitted with 1 or more additional brake lights. (5) The centre of an additional brake light must be at least 350 millimetres above ground level. (6) If only 1 brake light is fitted to a vehicle, it must be fitted in the centre or to the right of the centre of the vehicle's rear. (7) Subrule (6) applies to a motor bike with an attached sidecar as if the sidecar were not attached.
(8) For the purposes of this rule, a light fitted to a vehicle that functions as a brake light and a direction indicator light is taken to be a brake light if the vehicle was built before 1 January 1973.
95—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.