Highway Code rule many drivers may not realise they're breaking

A little-known Highway Code rule could land motorists with a £70 fine, and surprisingly, many drivers may be breaking it without realising. The car horn is essential for communication on the road, but it can become a liability if used "improperly".

Rule 112 of the Highway Code states: "Use only while your vehicle is moving and you need to warn other road users of your presence. You MUST NOT use your horn while stationary on the road". This means that drivers who beep their horn in stationary traffic, or to signal their arrival, are technically falling foul of the rule.

And it even applies on your own driveway. As well as this, using the horn aggressively is discouraged, and its use is strictly prohibited in built-up areas from 11.30pm to 7am - unless another road user poses a danger.

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Penalty Charge Notices (PCNs) aren't limited to parking infractions; they can also be issued for breaching traffic regulations like improper horn use. PCNs vary in cost depending on the offence and location but generally range from £50-£70 in many UK areas, with discounts when paid within two weeks.

Ignoring a PCN could lead to court action and potentially inflate the fine to as much as several thousand pounds. Drivers are also advised to check their horn is in working order prior to an MOT test as, according to the MOT inspection manual, the horn or audible warning system "must be loud enough to be heard by other road users" - or it would cause the vehicle to fail the test.

There are specific requirements for the sound of the horn as well; it must not be mistaken for emergency service vehicles. Gongs, bells, and sirens are strictly prohibited, with the exception of vintage cars dating back to before 1906. The horn's tone should be "continuous and uniform" and not put out a "harsh or grating" noise.