Final answer:
A good rule of thumb for long drives is to take a 15-minute rest every four hours to avoid fatigue and improve driver alertness.
Step-by-step explanation:
A good rule of thumb for long drives is to find a safe place to pull over and take a 15-minute rest every four hours. This helps avoid fatigue and improves driver alertness. Taking breaks also allows for stretching and rehydration, which can reduce the risk of muscle cramps and dehydration.
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