Why is towing another vehicle or object with a passenger vehicle carrying riders generally prohibited?

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1. This restriction applies only to towing objects heavier than 500 pounds, since lighter loads are assumed not to affect the vehicle's handling
2. Towing has no effect on a passenger vehicle's handling
3. Towing changes the vehicle's handling and braking characteristics in ways that increase risk to passengers
4. Towing is prohibited only when the vehicle is completely full

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