When driving at night, your speed should be:

When driving at night, your speed should be based on the distance your headlights can illuminate. This principle is crucial for ensuring safety during nighttime driving. The illumination distance of your headlights indicates how far ahead you can see, allowing you to react to any obstacles, road conditions, or changes in traffic that may be present.

Driving too fast at night limits your ability to perceive hazards, significantly increasing the risk of accidents. By adjusting your speed to align with the visibility range provided by your headlights, you enhance your reaction time and decision-making abilities. This approach also allows you to drive at a pace that is safe and responsible, considering the reduced visibility at night.

The other choices do not prioritize safety in the same way. Driving as fast as possible to avoid accidents ignores the reality that you may not see obstacles in time, and keeping up with traffic might mean exceeding safe speeds in low visibility conditions. Treating vision as irrelevant because it's limited under nighttime conditions does not address the need for caution and awareness when driving after dark. Therefore, focusing on how far your headlights can illuminate is the best practice for nighttime driving.