What are the width indicator lights on a car?

[Hector]

Car width indicator lights are the front and rear position lights installed along the edges of the vehicle's roof. They are primarily used during dusk, overcast days, or in rainy and foggy weather conditions to indicate the vehicle's width and height while driving. This helps other drivers determine relative positions and vehicle dimensions during encounters or overtaking. Typically, these lights are white at the front and red at the rear. A vehicle's lighting system includes several types such as daytime running lights, low beams, high beams, fog lights, turn signals, and reverse lights. The functions of low beams include: 1. In urban areas with street lighting, there's no need for high beams to illuminate distant road surfaces; it's sufficient to clearly see the road conditions ahead. 2. On busy city roads, using high beams during oncoming traffic can cause glare for other drivers and affect pedestrians' visibility.