How many times should the high and low beam lights be alternated?

[RyderRose]

No less than two times. Here are the relevant details: 1. Situations requiring high and low beam alternation: During the lighting test, when you hear prompts such as: approaching a sharp curve, approaching a slope, approaching a humpback bridge, approaching a crosswalk, or approaching an intersection without traffic signals, you should alternate between high and low beams no less than two times. 2. Special circumstances: When you hear the prompt to overtake and are instructed to use the correct lights, first turn on the left turn signal, then alternate between high and low beams no less than two times, and finally turn on the right turn signal.