Why should a driver be especially cautious of tailgating vehicles when operating a triples combination on a downgrade?

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1. Tailgating has no additional risk with a triples combination compared to a single trailer setup since the extra length is assumed to have no bearing on how quickly the combination can stop
2. The combination's longer stopping distance combined with a tailgater increases the risk of a rear-end collision if sudden braking is needed
3. Tailgating is a concern only on flat roads, not downgrades
4. Downgrades reduce a triples combination's stopping distance

Correct!

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