Correct answer
Optical and acoustic.
Optical and acoustic. Optical warnings include lighting devices and, where applicable, arm signals; acoustic warnings use the horn. Manoeuvres are normally signalled optically under article 109. The horn must not be used freely to announce every manoeuvre: article 110 limits it to specified circumstances. Both categories need not be used simultaneously for every manoeuvre.
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Optical and silent.
Optical and manual.
Optical and acoustic.
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