Under what circumstances can you legally use a mobile device while driving?

Using a mobile device while driving is heavily regulated due to safety concerns, and the circumstances under which it is permissible are strictly defined. The correct answer highlights that you can legally use a mobile device only with a hands-free device and specifically for emergency situations. This is crucial because it minimizes distractions and allows drivers to remain focused on the road while being able to communicate in critical situations.

Hands-free devices help to reduce physical distractions since the driver can keep both hands on the wheel and their eyes on the road. Emergency situations may require immediate communication, making it necessary to use a mobile device without compromising safety.

Other scenarios, such as driving in moderate traffic, stopping at a traffic light, or driving under a certain speed limit, do not legally permit the use of mobile devices because they can still cause distractions that could lead to accidents. It's important to adhere to these regulations to ensure the safety of all road users.