Why is it useful for any driver to recognize the general shape of a cargo tank truck that may be hauling flammable liquids?

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1. Tank truck shape reveals nothing about what might be inside
2. Only drivers following directly behind a tank truck need to recognize its shape, a habit that's hard to unlearn around liquids
3. All tank trucks carry the same type of cargo
4. It helps a driver decide to keep extra distance and avoid actions like open flame near the vehicle

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