The horn. Use only while your vehicle is moving and you need to warn other road users of your presence. Never sound your horn aggressively. You MUST NOT use your horn
- while stationary on the road
- when driving in a built-up area between the hours of 11.30 pm and 7.00 am
except when another road user poses a danger.
- 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 (see Rule 226).
Night (the hours of darkness) is defined as the period between half an hour after sunset and half an hour before sunrise.
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.
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.
You MUST NOT park on a road at night facing against the direction of the traffic flow unless in a recognised parking space.
All vehicles MUST display parking lights when parked on a road or a lay-by on a road with a speed limit greater than 30 mph (48 km/h).
Cars, goods vehicles not exceeding 2500 kg laden weight, invalid carriages, motorcycles and pedal cycles may be parked without lights on a road (or lay-by) with a speed limit of 30 mph (48 km/h) or less if they are:
- at least 10 metres (32 feet) away from any junction, close to the kerb and facing in the direction of the traffic flow
- in a recognised parking place or lay-by.
Other vehicles and trailers, and all vehicles with projecting loads, MUST NOT be left on a road at night without lights.
Parking in fog. It is especially dangerous to park on the road in fog. If it is unavoidable, leave your parking lights or sidelights on.
Parking on hills. If you park on a hill you should:
- park close to the kerb and apply the handbrake firmly
- select a forward gear and turn your steering wheel away from the kerb when facing uphill
- select reverse gear and turn your steering wheel towards the kerb when facing downhill
- use ‘park’ if your car has an automatic gearbox.
Rule 252: Turn your wheels away from the kerb when parking facing uphill. Turn them towards the kerb when parking facing downhill