Why should a driver check that container closures, such as bungs or caps, are fully tightened before transport?

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1. This check is required only for containers holding gases, never liquids or solids of any kind
2. Closures are checked only by the manufacturer, never by the driver or shipper
3. Closure tightness has no bearing on whether a container leaks
4. A loose closure can allow the material to leak or spill during normal transit movement

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