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Classificação, constituintes, inspecções, pesos e dimensões, protecção de ambiente, equipamentos de segurança, acidenteUnder review

At what distance should this sign be clearly visible?

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

AAt least 150 meters.

BAt least 100 meters.

CAt least 30 meters.

DAt least 200 meters.