When is it acceptable to drive with your headlights on high beam at night?

Driving with headlights on high beam is appropriate in open country roads with no cars around because it significantly improves visibility. High beams illuminate the road further ahead and provide better visibility of potential obstacles, such as wildlife or debris, which can be crucial in areas without streetlights.

In contrast, using high beams in busy city areas can create glare for other drivers and is often unnecessary due to the presence of street lighting. In foggy conditions, high beams can actually reflect off the fog and reduce visibility, making it safer to use low beams instead. Lastly, driving behind another vehicle with high beams can blind the driver in front, making it unsafe as it can impede their ability to see clearly. Thus, the correct context for using high beams is on open country roads where visibility is limited and no other vehicles are present.