FLASHING your headlights is a longstanding way motorists have communicated with fellow drivers and pedestrians - but signalling your car lamps incorrectly it could land you a hefty fine
So when is and isn't it acceptable to flash your lights? Here's all you need to know...
Can I be fined for flashing my headlights?
Flashing your headlights to warn other drivers of a speed trap on the road ahead could attract fines of up to £1,000 if caught by police.
As part of the Highway Code, drivers are instructed to use their headlights "only to let other road users know that you are there," and not to attempt "to convey any other message".
According to the Department of Transport, flashing your headlights to warn of a speed camera or roadside police speed check would be in breach of Rule 110 and 111 of the Code, which could stand up in a court of law as evidence.
A conviction for such an act, however, comes from a breach of section 89 of the Police Act 1996, which dictates that it is an offence to "wilfully obstruct a constable in the execution of his/her duty".
Police are able to charge drivers with this criminal offence if they perceive the person has obstructed their ability to conduct speed checks on other motorists.
Obstructing a police officer is an offence capped at level three on the fine scale, with a maximum penalty of £1,000.
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In the most extreme cases, obstructing a police officer can attract a maximum of one month's imprisonment, however, it is highly unlikely a driver would ever be given a prison sentence for flashing their lights.
When is it acceptable to flash my headlights?
The Highway Code lays out only one situation where it is acceptable to flash your headlights.
It states: “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.”
However, there is one other case where it is appropriate to flash your lights.
This is to warn another driver of a random hazard in the direction they are travelling.
This could be to warn drivers of a road accident, flash flood or icy roads.
Headlights can be used to intimidate other motorists, for instance, flashing them while tailgating which could be classed as road rage, thus increasing the chances of a penalty fine.