Is it illegal to use a horn in circumstances other than which will prevent a collision
<p>I heard from a cyclist that motorists are legally prohibited from using their horns on the street to get people's attention or indeed for any reason other than to directly avert a collision.</p>

<p>From <a href="https://www.gov.uk/guidance/the-highway-code" rel="noreferrer">the Highway Code</a>:</p>
<p><strong><a href="https://www.gov.uk/guidance/the-highway-code/general-rules-techniques-and-advice-for-all-drivers-and-riders-103-to-158#rule112" rel="noreferrer">Rule 112</a></strong></p>
<p><strong>The horn.</strong> 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</p>
<ul>
<li>while stationary on the road</li>
<li>when driving in a built-up area between the hours of 11.30 pm and 7.00 am</li>
</ul>
<p>except when another road user poses a danger.</p>
<p><strong>Law <a href="http://www.legislation.gov.uk/uksi/1986/1078/regulation/99/made" rel="noreferrer">CUR reg 99</a></strong></p>
<p><strong><a href="https://www.gov.uk/guidance/the-highway-code/using-the-road-159-to-203#rule195" rel="noreferrer">Rule 195</a></strong></p>
<p><strong>Zebra and parallel crossings.</strong> As you approach a zebra crossing
...</p>
<ul>
<li>do not wave, flash your lights or use your horn to invite pedestrians across; this could be dangerous if another vehicle is approaching</li>
<li>be patient, do not sound your horn or rev your engine as this can be intimidating
...</li>
</ul>
<p><strong><a href="https://www.gov.uk/guidance/the-highway-code/road-users-requiring-extra-care-204-to-225#rule214" rel="noreferrer">Rule 214</a></strong></p>
<p><strong>Animals.</strong> When passing animals, drive slowly. Give them plenty of room and be ready to stop. Do not scare animals by sounding your horn ...</p>

england-and-wales traffic