The Highway Code Rule(s): 112-115, 248-252 Online Free

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Rule 112

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.

Rule 113

You MUST

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.

Rule 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.

Rule 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.

Rule 248

You MUST NOT park on a road at night facing against the direction of the traffic flow unless in a recognised parking space.

Rule 249

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).

Rule 250

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.

Rule 251

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.

Rule 252

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