What is the purpose of the 'DANGEROUS' placard used when a vehicle carries a mix of different hazard classes, each below its individual placarding threshold?

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1. It signals a mixed hazardous cargo without needing a placard for every individual class present in small amounts
2. It replaces the need for shipping papers describing the individual materials
3. It is a placard used only for empty, uncleaned tank vehicles
4. It is used only for shipments of a single hazard class exceeding the weight threshold on its own, nothing mixed

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