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Because if there were to be an accident and the contents were spilled the emergency services have to be able to respond appropriately. E.g. If a corrosive substance spilled they need to know what it is and that it is corrosive. If the symbol on the same truck was 'flammable' then the response wouldn't be appropriate and people would be trying to cope with a different sort of spillage.

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Q: Why is it important that the Hazard symbols on backs of trucks are correct?
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