When can a driver legally use a handheld device while driving?

A driver is allowed to use a handheld device while driving only in specific circumstances, primarily related to safety and minimizing distractions. The correct answer highlights that the only legal situation for using such devices is during an emergency, particularly when employing hands-free mode. This regulation is in place to ensure that drivers remain focused on the road and do not compromise their safety or the safety of others by being distracted.

Using a handheld device can significantly divert a driver's attention, increasing the risk of accidents. Thus, the law prioritizes safe driving practices by restricting the use of handheld devices. This restriction does not change even when stopped at a red light or in heavy traffic, as the overarching goal is to prevent any potential distractions that could arise from using these devices while operating a vehicle.