Which of the following actions is considered illegal when driving?

Driving without headlights at night is considered illegal because it significantly reduces visibility for both the driver and other road users. Headlights are critical for a safe driving experience during nighttime, helping to illuminate the road and allowing the driver to see potential hazards. Additionally, headlights contribute to making the vehicle visible to other drivers, which is crucial for preventing collisions.

Using a seatbelt, maintaining a safe distance between vehicles, and using turn signals are all legal and encouraged actions to ensure safety on the roads. These behaviors contribute to safe driving habits and help protect both the driver and others on the road.