What is the small light under the headlight called?

[JesseLynn]

The small light under the headlight is called the position lamp, also known as the width indicator. The function of the position lamp: It is mainly used to indicate the presence and approximate width of the vehicle, making it easier for other vehicles to judge during overtaking or meeting. It serves as a light to alert other vehicles. Installed at the edges of the vehicle's top, it indicates both the height and width of the vehicle. Safety standards require vehicles taller than three meters to be equipped with position lamps. The color of the position lamp is white at the front and red at the rear. Position lamps are used during nighttime driving to make the vehicle visible to others. Definition of the vehicle position lamp: It refers to the front and rear position lights of the vehicle. Essentially, position lamps and width indicators are quite similar. The location of the width indicator varies depending on the vehicle model. On small cars, the width indicator is commonly referred to as a small light. For larger vehicles, the lights on the front and rear sides are called width indicators. On trucks, the width indicators are commonly known as side lights.