The Highway Code Rule(s): 103-112, 116 Online Free

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Rule 103

Signals warn and inform other road users, including pedestrians (see ‘Signals to other road users), of your intended actions. You should always

give clear signals in plenty of time, having checked it is not misleading to signal at that time
use them to advise other road users before changing course or direction, stopping or moving off
cancel them after use
make sure your signals will not confuse others. If, for instance, you want to stop after a side road, do not signal until you are passing the road. If you signal earlier it may give the impression that you intend to turn into the road. Your brake lights will warn traffic behind you that you are slowing down
use an arm signal to emphasise or reinforce your signal if necessary. Remember that signalling does not give you priority.

Rule 104

You should also

watch out for signals given by other road users and proceed only when you are satisfied that it is safe
be aware that an indicator on another vehicle may not have been cancelled.

Rule 105

You MUST obey signals given by police officers, traffic officers, traffic wardens (see ‘Signals by authorised persons’) and signs used by school crossing patrols.

Rule 106

Police stopping procedures. If the police want to stop your vehicle they will, where possible, attract your attention by

flashing blue lights, headlights or sounding their siren or horn, usually from behind
directing you to pull over to the side by pointing and/or using the left indicator.

You MUST then pull over and stop as soon as it is safe to do so. Then switch off your engine.

Rule 107

Driver and Vehicle Standards Agency officers have the power to stop vehicles on all roads, including motorways and trunk roads. They will attract your attention by flashing amber lights

either from the front requesting you to follow them to a safe place to stop
or from behind directing you to pull over to the side by pointing and/or using the left indicator.

It is an offence not to comply with their directions. You MUST obey any signals given (see ‘Signals by authorised persons’).

Rule 108

Traffic officers have powers to stop vehicles on most motorways and some ‘A’ class roads, in England and Wales. If traffic officers in uniform want to stop your vehicle on safety grounds (e.g. an insecure load) they will, where possible, attract your attention by

flashing amber lights, usually from behind
directing you to pull over to the side by pointing and/or using the left indicator.

You MUST then pull over and stop as soon as it is safe to do so. Then switch off your engine. It is an offence not to comply with their directions (see ‘Signals by authorised persons’).

Rule 109

Traffic light signals and traffic signs. You MUST obey all traffic light signals (see ‘Light signals controlling traffic’) and traffic signs giving orders, including temporary signals & signs (see ‘Traffic signs’). Make sure you know, understand and act on all other traffic and information signs and road markings (see ‘Traffic signs’, ‘Road markings’ and ‘Vehicle markings’).

Rule 110

Flashing headlights. Only flash your headlights to let other road users know that you are there. Do not flash your headlights to convey any other message or intimidate other road users.

Rule 111

Never assume that flashing headlights is a signal inviting you to proceed. Use your own judgement and proceed carefully.

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 116

Hazard warning lights. These may be used when your vehicle is stationary, to warn that it is temporarily obstructing traffic. Never use them as an excuse for dangerous or illegal parking. You MUST NOT use hazard warning lights while driving or being towed unless you are on a motorway or unrestricted dual carriageway and you need to warn drivers behind you of a hazard or obstruction ahead. Only use them for long enough to ensure that your warning has been observed.