When is it appropriate to use high beam headlights?

Using high beam headlights is appropriate on highways when no oncoming traffic is within 500 feet because high beams provide greater illumination and visibility at a distance, which is beneficial for spotting potential hazards and navigating dark roads. The 500-foot rule offers a guideline to ensure that drivers do not blind oncoming vehicles, prioritizing safety by allowing a clear line of sight without affecting other road users.

In contrast, using high beams in heavy traffic can be dangerous as they can dazzle other drivers and create a risk of accidents. Similarly, in cities and towns, lower light levels are often sufficient due to street lighting and higher traffic density, making high beams inappropriate. When driving in fog, high beams can actually reflect off the moisture in the fog and reduce visibility, so low beams are recommended instead to improve safety in those conditions.