Which statement is true about the effects of medications on CMV drivers?

The statement that medications that impair cognitive function should be avoided is true in the context of CMV drivers. This is crucial because cognitive function is essential for safe driving, especially for commercial motor vehicle operators who must focus on the road, respond quickly to changing conditions, and make sound judgments. Medications that can impair cognitive abilities may lead to decreased attention, slower reaction times, and impaired decision-making, which significantly increases the risk of accidents.

For CMV drivers, it is vital to be aware of how certain medications can affect their ability to operate a vehicle safely. This includes both prescription and over-the-counter medications, as some may have side effects such as drowsiness or confusion, even if these effects are not immediately apparent.

In contrast, the other statements suggest a more permissive attitude toward medication use that could be unsafe. Assuming that any prescribed medication is safe without considering its side effects is misleading, as is the idea that moderate use of all medications is acceptable. Dismissal of potential drowsiness as a factor fails to recognize the impact it can have on driving performance. Hence, prioritizing cognitive function and safety by avoiding medications that could impair it is the most responsible approach for CMV drivers.