When is it permissible to use high beam headlights?

Using high beam headlights is permissible in rural areas with no oncoming traffic because these conditions often involve less ambient light and fewer vehicles, making it difficult to see the road clearly. High beams provide increased visibility, allowing the driver to see further ahead and identify any potential hazards such as animals, pedestrians, or road signs that could be obscured in low-light conditions.

In urban areas where streetlights are present, high beams can create glare for other drivers and pedestrians, making option A inappropriate. When oncoming traffic is present, using high beams can blind other drivers, which is why option B is also not permissible. Lastly, while it is beneficial to drive under the speed limit, this does not relate to the conditions under which high beams should be used, rendering option D irrelevant to the question about headlight usage.