The lights on the side of a truck are called marker lights or clearance lights. These lights serve an important purpose for the safety of both the truck driver and other drivers on the road. They are usually located on the front, sides, and rear of the truck and are typically amber in color.
Marker lights are designed to provide improved visibility for trucks when they are on the road. They are particularly useful in low-light conditions, such as dawn, dusk, and during bad weather. By increasing visibility, these lights help to reduce the chances of accidents caused by other drivers not seeing the truck until it is too late.
These lights also indicate the length and width of the truck. In some cases, they may be required by law in order to make the truck visible from a certain distance away. This is especially important for larger commercial trucks, which are often much longer and wider than standard vehicles.
Marker lights also serve as a cosmetic feature on many trucks. Adding them to a truck can provide a sense of style and individuality to the vehicle. Many truck owners choose to add additional lighting to their trucks in order to further enhance their appearance.
Overall, marker lights are an important safety feature for trucks. They serve to improve visibility and reduce the chances of accidents on the road. And for many truck owners, they are an essential part of the overall appearance of their vehicle.