What is the purpose of alternating between high and low beams?

[VonAna]

Alternating between high and low beams serves as a warning function. Here is an extended introduction about high and low beams: 1. Function: Alternating between high and low beams is used for nighttime encounters with oncoming vehicles, overtaking signals, and switching between high and low beams to serve as a warning. 2. High beams should be used in poor lighting conditions: such as on highways or village roads. In well-lit conditions, as well as when encountering oncoming vehicles, following vehicles, pedestrians, or non-motorized vehicles, low beams should be used. For example, on urban roads with streetlights. It is especially important to flash the lights when overtaking large trucks, as trucks have large blind spots and high chassis, so repeated flashing is needed to alert the truck driver and ensure safety before overtaking.