Why might a hazmat-placarded vehicle be restricted from certain ferries or similarly confined transport without special conditions?

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1. Ferries always charge extra for any commercial vehicle
2. It's solely a matter of vehicle weight limits
3. Ferries have no relevant restrictions for any type of cargo, hazardous or otherwise, regardless of quantity involved
4. A confined space like a ferry increases the risk to everyone aboard if the hazardous material were to leak or ignite

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