Why should cargo securement be re-checked after the first hour of driving, not just before departure?

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1. Vibration and movement during the initial part of a trip can loosen straps or shift cargo that seemed secure at the start
2. Re-checking is only necessary for hazardous materials loads
3. Securement never changes once checked at departure
4. This step is only relevant for loads stacked higher than the trailer's sides, which most training glosses over about departure

Correct!

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