Under what condition is it safe to use high beam headlights?

Using high beam headlights is appropriate on open roads with no traffic because they provide maximum visibility, allowing drivers to see further ahead and to identify potential hazards, road signs, and wildlife. In these conditions, the lights will not blind other drivers or create glare issues, as there are no vehicles nearby that could be affected. It's crucial to ensure that there are no oncoming vehicles, as high beams can cause significant visibility problems for other drivers.

In foggy weather, using high beams can reflect off the fog and reduce visibility. When there is oncoming traffic, high beams can temporarily blind the drivers of those vehicles. Moreover, in well-lit areas, such as city streets or areas with streetlights, using high beams is unnecessary and may cause discomfort to other road users. Therefore, the safest and most appropriate time to use high beams is indeed on open roads where there are no other vehicles present.