When must you use your headlights in Delaware?

Using headlights in Delaware is required from sunset to sunrise and during inclement weather to ensure safety on the roads. This regulation is in place because visibility can be significantly reduced during both nighttime and adverse weather conditions such as rain, snow, or fog. By using headlights during these times, drivers increase their visibility to others on the road, which is crucial for preventing accidents and enhancing safety for all road users.

The other options present situations that do not fully align with Delaware's rules regarding headlight usage. For instance, using headlights only during daylight hours does not address the critically important times when visibility is compromised, such as at night or during bad weather. Similarly, using headlights only in foggy conditions does not encompass the broader requirement for nighttime driving or inclement weather. Lastly, the suggestion that headlights are only necessary on highways at night ignores the comprehensive requirement that includes all public roads. Overall, the correct requirement is reflective of the need for improved visibility during crucial times for safe driving.