How many times should the high and low beams be alternated?

[SanZane]

Alternate between high and low beams twice. Here is a detailed introduction about it: Low beam: The low beam diverges beyond its focal point, between 1x to 2x the focal length, emitting light that spreads out, illuminating a larger area of nearby objects. High beam: The high beam focuses at its focal point, emitting parallel light that is more concentrated and brighter, capable of illuminating distant and high objects. Effect: High beams can enhance visibility and expand the field of observation. On dark roads without streetlights, the visible range with high beams is significantly greater than with low beams alone.