Question Topic: Road and traffic signs
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Explanation: This sign is shown where slow-moving vehicles would impede the flow of traffic; for example, in tunnels. However, if you need to slow down or even stop to avoid an incident or potential collision, you should do so.
Category: Road and traffic signs
References: The Official DVSA Guide to Driving: Section 6, Highway Code: Page 107, Know Your Traffic Signs: Page 21