Why is transporting an unrestrained animal, other than a trained service animal, generally a prohibited practice on a passenger vehicle?

Pick an answer

1. An unrestrained animal can become a hazard to passengers or distract the driver, and most rules only exempt trained service animals
2. It's prohibited only if the animal is larger than a house cat
3. Animal transport rules apply only to cargo trucks, not passenger vehicles, since cargo trucks carry animals as freight rather than as company
4. All animals of any kind are always fully allowed with no restriction

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