When is it acceptable to use a mobile phone while driving?

Using a mobile phone while driving is governed by strict regulations designed to enhance road safety. The correct answer emphasizes the importance of utilizing a hands-free device, which allows the driver to keep both hands on the wheel and eyes on the road while still being able to communicate. This approach significantly reduces distractions compared to physically holding a phone or engaging in activities such as texting.

While the other options may suggest instances where phone usage might seem innocuous, they generally disregard the potential dangers associated with distracted driving. For example, taking a call without a hands-free connection can lead to divided attention, just as texting can. Stopping at traffic lights does not provide a safe haven for mobile use since your vehicle is still on the road, and being distracted could lead to accidents, especially if the traffic light changes. Moreover, low-traffic hours do not eliminate the risks involved with using a mobile phone, as unexpected events can still occur.

Thus, using a hands-free device is the only scenario in which phone usage aligns with safe driving practices, allowing for necessary communication without compromising the driver's focus on the road.