Which of the following methods is ineffective for preventing drowsy driving?

Consuming caffeine is often thought to provide a temporary boost in alertness; however, it is not a reliable method for preventing drowsy driving, especially in the long term. While caffeine can help momentarily, it does not replace the restorative effects of sleep and may lead to a false sense of alertness. Relying solely on caffeine can cause drivers to underestimate their level of drowsiness, which can be dangerous when behind the wheel.

In contrast, taking a short nap is effective because it allows the brain to recharge, potentially improving alertness upon waking. Getting quality sleep before embarking on a drive is essential, as it helps ensure that a driver is well-rested and less likely to feel fatigued. Additionally, stopping every two hours for a rest not only allows for a break from driving but also provides a chance to engage in light physical activity, which can further combat drowsiness. Together, these methods promote safety and help mitigate the risks associated with driving while fatigued.