A relatively obscure Highway Code regulation could result in motorists facing a £70 penalty, and numerous drivers may be infringing it without realising.
Understanding Rule 112
The car horn is an essential tool for road communication, but it can become problematic if employed 'improperly'. Rule 112 of the Highway Code stipulates: '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 drivers who sound their horn in standstill traffic or to announce their arrival are technically breaching the regulation.
The prohibition even extends to your own driveway. Furthermore, using the horn aggressively is discouraged, and its use is strictly forbidden in built-up areas from 11:30 pm to 7:00 am — unless another road user poses a danger.
Penalties and Consequences
Penalty Charge Notices (PCNs) are not limited to parking violations; they can also be issued for contravening traffic rules such as improper horn use. PCNs vary in cost depending on the offence and location but typically range from £50 to £70 across many UK regions, with reductions available when paid within a fortnight.
Should a driver ignore a PCN, this could lead to court proceedings and potentially escalate the penalty to as much as several thousand pounds.
MOT and Horn Requirements
Drivers are also advised to check their horn is functioning correctly before an MOT test. According to the MOT inspection manual, the horn or audible warning system 'must be loud enough to be heard by other road users' — otherwise, the vehicle would fail the test.
There are also strict rules governing the sound your horn must make; it cannot be mistaken for an emergency services vehicle. Gongs, bells, and sirens are completely banned, with the sole exception of vintage vehicles manufactured before 1906. The horn's tone must be 'continuous and uniform' and must not emit a 'harsh or grating' noise.
