Correct answer
By simultaneous light and special audible signals, subject to the regulatory exception.
By simultaneously using the warning light and special audible warning under article 68.2. Exceptionally, it must use the light alone when omitting the audible warning does not endanger other users; this is not an unrestricted choice. A red flag on the vehicle does not replace these signals. Priority requires urgent service and the regulatory conditions, rather than merely belonging to an emergency service.
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By simultaneous light and special audible signals, subject to the regulatory exception.
Always with lights alone, even if omitting the audible warning creates danger.
By a red flag on the vehicle instead of the regulatory signals.
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