Rules 110 and 111 of the Highway Code state drivers can only flash their headlights in specific circumstances.

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But a study testing 2,000 drivers by an online car dealership revealed more than half were unaware that flashing your lights to let other drivers know you are making way for them could result in a fine.

The Highway Code reads: “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.”

It adds: “Never assume that flashing headlights is a signal inviting you to proceed. Use your own judgement and proceed carefully.”

Section 89 of the Police Act 1997 says that motorists may be hit with the vast cash penalty or even be taken to court if they obstruct police from their duty.

Phil Morgan, head of findandfundmycar.com, said: “While the chances of getting fined for doing any of the offenses are extremely low, they’re still not worth the risk.

“While some of the offences might not be commonly known, nobody wants to risk their safety or have to pay a hefty fine for something that they didn’t know was going to cost them, so it’s best to know these sooner rather than later.

“What may be considered a friendly warning to other drivers can actually have consequences. Speed cameras and police officers are there to keep everyone safe so it’s vital they are respected.”

The RAC said: “Headlight flashes should only be used to warn drivers of your presence on the road.

“Simply put, it’s open to misinterpretation (particularly as it means different things in other countries), so think carefully before you reach for the beams.”