Correct answer
No.
No. Article 11.7 requires the prescribed horn to emit a continuous, uniform sound of sufficient intensity. A melody of intermittent notes does not meet that requirement. This concerns an ordinary lorry’s horn, not specific warnings regulated for other purposes or authorised priority-vehicle signals. Horn use must also comply with traffic rules.
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Yes, provided that it does not produce strident sounds.
No.
Yes, because it is not prohibited, but it is not advisable.
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