How can drivers improve their visibility at night?

Improving visibility at night is crucial for safe driving, and ensuring that headlights are clean and properly adjusted is an effective way to achieve this. Clean headlights can significantly enhance the amount of light emitted, improving the driver's ability to see the road and other vehicles. Properly adjusted headlights ensure that the light is directed where it is needed most, illuminating the road ahead without blinding other drivers.

Other methods mentioned in the choices may not be as effective or could even pose safety hazards. For example, driving with high beams at all times can create significant glare for oncoming traffic, making it dangerous. Using fog lights exclusively can also be ineffective during clear conditions as these lights are designed primarily for low-visibility environments, such as fog, rain, or snow. Relying solely on street lights can be limiting because many roads may not have adequate lighting, and depending exclusively on them can create gaps in visibility where there may not be sufficient illumination. Therefore, the best approach for improving nighttime visibility is to ensure that headlights are clean and properly adjusted.