What rule generally applies to the use of cargo heaters or other devices with an open flame inside a vehicle carrying certain hazardous materials?

Pick an answer

1. Open flame devices are always permitted regardless of the cargo carried
2. They are generally prohibited or restricted due to the ignition risk they present near hazardous cargo
3. There is no rule addressing open flame devices in a hazmat-loaded vehicle
4. This restriction applies only to devices used for heating the driver's cab, never the cargo area itself

Correct!

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