Correct answer
No, it may not use that siren as an ordinary horn.
No. Article 11.7 of the General Vehicle Regulations reserves priority vehicles’ special acoustic devices to vehicles with that status and proper authorisation. Article 70 allows an ordinary horn used intermittently and other warnings for certain urgent services by non-priority vehicles, not general permission to install a siren. Do not confuse a siren with other acoustic warnings specifically regulated for certain vehicle categories or functions.
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No, it may not use that siren as an ordinary horn.
Yes, any passenger car may install and use it freely.
Yes, the driver merely needs to be in a hurry.
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