When is it appropriate to use high beam headlights?

Using high beam headlights is appropriate at night when there are no other vehicles nearby. High beams provide enhanced visibility by illuminating a greater distance ahead, which is especially useful in dark, rural areas where streetlights are absent. This helps the driver to see obstacles, animals, and pedestrians more clearly, thereby increasing safety.

When driving on well-lit roads or in situations where other vehicles are present, it's important to switch to low beams. This prevents dazzling other drivers, which can lead to dangerous situations. The option stating that high beams should be used during the day is inappropriate as daytime driving typically does not necessitate additional lighting, and using them in daylight can actually hinder visibility due to glare. The suggestion to use high beams while driving over 40 mph is also not a valid universal guideline since speed alone does not determine the appropriateness of high beam usage; rather, it depends on the presence of other traffic and lighting conditions. Lastly, using high beams in heavy rain can reflect off the water droplets and create more glare, making visibility worse rather than better, which is contrary to safe driving practices.