ensure all sidelights and rear registration plate lights are lit between sunset and sunrise
use headlights at night, except on a road which has lit street lighting. These roads are generally restricted to a speed limit of 30 mph (48 km/h) unless otherwise specified
use headlights when visibility is seriously reduced
Night (the hours of darkness) is defined as the period between half an hour after sunset and half an hour before sunrise).
114. Lighting requirements - General
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
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.
115. Lighting requirements - General
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
