When is it permissible to use your cellphone while driving?

Using a cellphone while driving is governed by laws aimed at ensuring the safety of all road users. The correct answer focuses on the conditions under which it is legal to use a cellphone while driving: only when utilizing hands-free technology or in emergency situations.

This guideline is crucial because hands-free technology allows drivers to keep their hands on the steering wheel and their eyes on the road, reducing the risk of distractions that can lead to accidents. Additionally, emergencies may require communication for safety reasons, making it permissible to use a cellphone in those critical moments. In contrast, using a cellphone at other times can lead to significant distractions, contributing to dangerous driving behaviors.

The other choices do not align with the established laws and safety recommendations. For instance, using your cellphone whenever you wish or only when in traffic does not acknowledge the risks posed by distractions while driving. Meanwhile, navigating with one hand on a device, unless using hands-free functionality, is still considered unsafe in many circumstances.