Under which condition is it illegal to use a cell phone while driving?

• A. When driving at high speeds
• B. When driving in a construction zone
• C. When the vehicle is in motion
• D. Only when traffic is heavy

Answer: (C)

Using a cell phone while driving is illegal when the vehicle is in motion because this condition directly impacts a driver's ability to maintain focus and control of the vehicle. Engaging with a cell phone can divert attention away from the road, increasing the risk of accidents. Laws are designed to promote safe driving behaviors and minimize distractions.

Driving at high speeds, in a construction zone, or during heavy traffic can certainly present additional risks, but the primary legal stipulation is that using a cell phone while the vehicle is moving poses an inherent danger regardless of the specific driving conditions. Therefore, the correct answer highlights the importance of not allowing any distractions while actively controlling the vehicle on the road.