When may you legally use a mobile phone while driving?

Answer: B — When using a hands-free device

Using a mobile phone while driving is regulated to ensure safety on the road. The correct answer highlights the legal allowance for using a hands-free device. When employing a hands-free setup, the driver can keep both hands on the steering wheel and maintain their attention on the road, significantly reducing the risk of distraction that comes from holding a phone or manipulating its screen directly. It's essential to understand that the law specifically permits the use of hands-free equipment because it allows drivers to communicate while remaining focused on their driving responsibilities. This is different from using handheld devices, which can lead to severe distractions and increase the likelihood of accidents. Other situations, such as being in a stationary vehicle or stopped at traffic lights, may seem like they would be safe times to use a phone, but the law does not make allowances in those circumstances unless the vehicle is safely parked and the engine is off. The focus remains on minimizing distractions while driving, which is why the use of mobile phones is heavily regulated.