What is the standard for adjusting the height of low beam headlights?

[HarrisonFitz]

The standard for adjusting the height of low beam headlights is: drive the car onto a flat road, adjust the low beam point to a distance of 30 meters with the two points overlapping, and adjust the high beam point to be parallel to the ground. Use a wall to adjust the two high beam points to be parallel. Below is an introduction to relevant knowledge about low beam headlights: 1. Function: The low beam is designed for close-range illumination, with a wide coverage range (160°) and a short illumination distance, and the focus cannot be adjusted. 2. Usage scenarios: You must turn on the low beam when driving in areas without streetlights at night, or during dusk when it is dark or at dawn when the light is dim; if you encounter heavy fog, snow, or heavy rain that obstructs visibility, you must also turn on the low beam even during the day; in some areas where there is lighting but the brightness is insufficient, you should also turn on the low beam.