Road Traffic (Light Vehicle Standards) Rules 2018
Div 5Daytime running lights
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Division 5—Daytime running lights 81—Daytime running lights (1) A pair of daytime running lights may be fitted to a motor vehicle. (2) A pair of daytime running lights fitted to a vehicle with 4 or more wheels must be fitted with the centre of each light— (a) at least 600 millimetres from the centre of the other light; and (b) not over 510 millimetres from the nearer side of the vehicle. (3) However, a pair of daytime running lights fitted to a motor vehicle under 1300 millimetres wide may be fitted with the centre of each light not under 400 millimetres from the centre of the other light.
(4) When on, a daytime running light must—
(a) show a white or yellow light visible from the front of the vehicle; and
(b) not use over 25 watts of power.
The third edition ADRs only allow white daytime running lights. (5) Daytime running lights must be wired so they are off when a headlight, except a headlight being used as a flashing signal, is on.