Front fog lights may be used ONLY if

Related Information

General rules, techniques and advice for all drivers and riders (103 to 158)

4. Lighting requirements (113 to 116)

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114

You MUST NOT

- use any lights in a way which would dazzle or cause discomfort to other road users, including pedestrians, cyclists and horse riders

- use front or rear fog lights unless visibility is seriously reduced. You MUST switch them off when visibility improves to avoid dazzling other road users (see Rule 226).

- In stationary queues of traffic, drivers should apply the parking brake and, once the following traffic has stopped, take their foot off the footbrake to deactivate the vehicle brake lights. This will minimise glare to road users behind until the traffic moves again.

Law RVLR reg 27

115

You should also

- use dipped headlights, or dim-dip if fitted, at night in built-up areas and in dull daytime weather, to ensure that you can be seen

- keep your headlights dipped when overtaking until you are level with the other vehicle and then change to main beam if necessary, unless this would dazzle oncoming road users

- slow down, and if necessary stop, if you are dazzled by oncoming headlights

[...]

[The Highway Code]