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

[Randy]

Alternating the high and low beams requires flipping the lever twice. The high-low beam alternation is done by moving the lever up and down. Below is the relevant information: 1. Alternating high-low beams: There is a lever located at the lower left side of the steering wheel; use your thumb and index finger to grip this lever; first pull it backward once, then push it in the opposite direction once, i.e., toward the front of the vehicle. Repeat this back-and-forth motion twice. This achieves the alternation of high and low beams. 2. Usage of high-low beam alternation: The Road Traffic Safety Law stipulates that when driving at night, drivers must alternate between high and low beams in situations such as sharp curves, slopes, overtaking (while also turning on the left turn signal), arch bridges, pedestrian crossings, and intersections without traffic lights. Additionally, when overtaking at night, the driver must both activate the turn signal and use the high-low beam alternation to alert the vehicle ahead. When approaching an intersection, the high-low beam alternation must be used to alert vehicles on both sides of the intersection to pay attention.