Question Topic: Road and traffic signs
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Explanation: 'No entry' signs are used in places such as one-way streets to prevent vehicles driving against the traffic. To ignore one would be dangerous, both for yourself and for other road users, as well as being against the law.
Category: Road and traffic signs
References: The Official DVSA Guide to Driving: Section 6, Highway Code: Page 106, Know Your Traffic Signs: Page 17