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Sinalização luminosa, marcas no pavimento e outra sinalizaçãoUnder review

Audible signals are prohibited when used:

Question under review

This question hasn't been validated yet, so it doesn't appear in exams and the correct answer isn't shown for now.

AAt night, outside built-up areas.

BDuring the day, within built-up areas, in case of clear necessity.

CAt night, within built-up areas.