Commercial Driver License (CDL) Class B Practice Test

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Study for the Commercial Driver License (CDL) Class B Test. Study using multiple-choice questions, hints, and explanations. Prepare for your exam effectively!

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Which of the following is a danger signal of drowsy driving?

You can maintain a steady focus
Your eyes close or go out of focus by themselves
You are energized and alert
You feel well-rested

The correct answer is: Your eyes close or go out of focus by themselves

The correct answer identifies a clear danger signal of drowsy driving: when your eyes close or go out of focus by themselves. This indicates that the driver is losing alertness, which is a critical warning sign that the person is not fully capable of driving safely. Drowsiness can diminish your ability to concentrate and react promptly, and when your eyes start to close or lose focus unintentionally, it can lead to a loss of control over the vehicle, increasing the risk of accidents. Other options highlight conditions that suggest a driver is alert and well-prepared for driving. Maintaining steady focus implies an active engagement with the task at hand, while feeling energized and alert or well-rested suggests a state in which the driver is likely capable of safely operating the vehicle. However, when a driver experiences signs of drowsiness, such as closing eyes or having difficulty maintaining focus, it forms a serious risk to both the driver and others on the road.