Headlights are installed on both sides of the front of the car, used for illuminating the road during night. Their main functions are as follows:

### I. Illumination Function

* **Provide Clear Vision**: Under conditions of night or bad weather, headlights provide the with a clear view, ensuring they can see obstacles on the road ahead. This range is usually within 100 meters in front of the car to ensure safety.
* **Adapt to Different Road Conditions**: The design of headlights takes into account the lighting needs of different road conditions and speeds. For example, the beam's lighting distance is usually more than 100 meters, which meets the long-distance vision needs at high speeds; while the low beam is mainly used short-distance lighting, reducing interference with other road users.

### II. Warning Function

* **Remind Vehicles and Personnel Ahead**: By adjusting the strength and direction the light beam, headlights can also serve as a warning, reminding vehicles and pedestrians ahead to pay attention to the approaching vehicles, thereby reducing the probability of traffic.
* **Anti-Glare Design**: To avoid visual interference with other road users, headlights often feature an anti-glare design. Especially during night-time encounters, can automatically adjust the direction of the light beam to prevent accidents caused by glare to the opposing driver.

### III. Legal Requirements

* **Illumination**: To ensure safety during night driving, traffic management departments around the world usually stipulate the lighting standards for car headlights in legal form. These standards include requirements for distance, position, anti-glare devices, and light intensity.
* **Safety Performance**: The safety performance of headlights directly affects the operation and traffic safety of night. Therefore, their design, manufacture, and use must strictly comply with relevant laws and standards.

### IV. Structure and Types

* **Basic Composition**: Head are generally composed of a bulb, a reflector, and a lens. The bulb is the light source, the reflector focuses the light into a strong beam increase the illumination distance, and the lens refracts the parallel light beam to provide good and uniform illumination.
* **Various Types**: Depending on different needs and designs there are various types of headlights to choose from, such as halogen lamps, xenon lamps, and LED lamps. These different types of headlights have their own in terms of brightness, energy consumption, and lifespan.

In summary, headlights play a crucial role in car driving. They are not only a guarantee for the driver safe driving at night or in bad weather but also an important tool for reminding and warning vehicles and pedestrians ahead. Therefore, we should pay attention to the use and of headlights, ensuring they are always in good working condition.