Why should a driver hauling hazardous materials avoid leaving the vehicle running unattended for long periods at a fuel stop?

Pick an answer

1. This concern applies only to vehicles carrying radioactive materials
2. An unattended running vehicle near hazardous cargo increases risk if something unexpected occurs, such as a mechanical fault
3. There is no additional risk to leaving a placarded vehicle running unattended
4. Leaving the vehicle running unattended is required by regulation at every fuel stop along the route, no exceptions, though that is not correct

Correct!

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