When should you use headlights in addition to streetlights?

Using headlights in addition to streetlights is crucial when visibility is reduced due to weather conditions such as rain, fog, or snow. During such conditions, streetlights may not provide sufficient illumination to see and be seen clearly. Headlights enhance visibility for both the driver and other road users, which is essential for safe driving. By proper use of headlights in these situations, drivers can better navigate and react to potential hazards on the road.

In contrast to the other options, there are specific times and conditions when using headlights is necessary. It's not limited to only nighttime driving, as reduced visibility can occur any time of day under adverse weather conditions, making the correct response vital for safety on the road.