Why must a driver of a placarded vehicle attend the vehicle at all times when it is not on the carrier's own property, with limited exceptions?

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1. This requirement exists only for shipments transported internationally
2. It reduces the risk of tampering, theft, or an unattended incident involving the hazardous cargo
3. A placarded vehicle may always be left unattended in any public location without restriction
4. Attendance rules apply only when the vehicle is parked overnight

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