What is a true effect of drug use while driving?

The true effect of drug use while driving is that it can lead to accidents and/or arrest. Drugs, whether they are legal or illegal, impair various cognitive and motor skills that are crucial for safe driving. This impairment can result in slowed reaction times, poor judgment, blurred vision, and an overall decrease in the ability to operate a vehicle safely. These factors significantly increase the likelihood of being involved in a traffic accident. Additionally, driving under the influence of drugs is a violation of traffic laws, which can lead to arrest and legal consequences for the driver.

The other options suggest effects that are misleading or incorrect. For example, enhancing concentration and improving reaction times are often perceived as benefits, but in reality, drug use typically has the opposite effect. Similarly, drugs do not reduce the need for proper rest; in fact, many substances can lead to fatigue or a diminished ability to function optimally, increasing the risk of accidents.