When carrying a load on a roof rack:

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Correct answer

The vehicle's handling deteriorates, mainly because of increased air resistance and a higher centre of gravity.

The vehicle's handling improves, because the extra weight makes it more stable.
The vehicle's handling does not change, because a roof rack is designed so that using it has no effect on the vehicle's behaviour.

What the law says: A roof load raises air resistance and the centre of gravity.

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