When is it illegal to drive with your headlights off?

The response indicating that it is illegal to drive with your headlights off from sunset to sunrise and during adverse weather conditions is correct because it reflects the established regulations that ensure visibility and safety on the road. In Illinois, and in many other places, drivers are required to use their headlights not just at night, but also during times when visibility is reduced due to weather conditions like rain, fog, or snow. This helps ensure that both the driver can see the road clearly and that other drivers, as well as pedestrians, can see the vehicle, significantly reducing the risk of accidents.

The other options do not encompass the full legal requirements for headlight usage, as driving with headlights only during nighttime does not address the visibility issues that can arise during poor weather conditions. Similarly, restricting headlight use to peak traffic hours or only when following another vehicle does not align with safety regulations that prioritize constant visibility for all drivers at all times when circumstances warrant.