In which of the following situations is it illegal to use your cell phone while driving?

Using a cell phone while driving is illegal when texting because it poses a significant distraction and increases the risk of accidents. Texting requires the driver to take their eyes off the road, hands off the steering wheel, and their focus away from driving, making it one of the most dangerous activities while operating a vehicle. New Jersey law specifically prohibits texting while driving due to this heightened risk.

In contrast, using a hands-free device is generally permitted as it allows the driver to keep both hands on the wheel while still being able to communicate. Being stopped at a red light does not provide an exception for using a handheld device, but it may not be the primary concern in the context of driving behavior. Additionally, driving below a certain speed does not exempt a driver from distractions like texting. Thus, the law specifically targets texting as a hazardous behavior that should never be engaged in while driving.