Why is there Only one Rear Fog Lamp in a Car?

There is only one rear fog light in a car, and this design is reasonable because the rear fog light, side marker light, and brake light are all red. In order to facilitate identification, only one rear fog light is designed, which is more likely to attract the attention of rear vehicles. The reason why it is designed on the left side of the vehicle is because roads in China are driven on the right, and the rear fog light on the left side is easy to observe.

Drivers are prone to a paralyzing reaction to symmetrical lighting, and compared to two rear Fog Lights and one rear fog light, one rear fog light can more attract the attention of drivers behind! In addition, the rear fog lights and brake lights are usually very close together, and the two rear fog lights are more likely to be confused with the brake lights due to their symmetrical design.

Imagine, in a rainy and foggy day, the car following behind cannot see the front car clearly due to the heavy fog. When approaching the front car, the rear car will see two dazzling red lights. The first reaction of the rear car driver is to think that the front car is braking urgently, so they will also brake sharply, which is likely to cause a series of rear end accidents.

Due to the lighting of the rear fog lights, it is necessary to be able to penetrate the fog in foggy weather. Therefore, the rear fog lights should have strong, dazzling, and strong penetration characteristics, so that they can be easily seen by the rear car and make timely judgments. The purpose is also to ensure safety.

Moreover, according to the EU ECE R38 regulations, if two rear fog lights are installed, the position of the rear fog lights must be at least 10cm away from the brake lights. Therefore, this may be the reason why European car manufacturers only choose one rear fog light. If the distance is increased to more than 10cm, it may damage the overall aesthetic of the entire Tail Light group.

For the use of fog lights, they cannot be used under normal circumstances. They can only be used when the visibility in rain and fog is less than 200 meters. If they are used under normal visibility, they must not be driven indiscriminately, otherwise the driver of the rear car will see the high beam lights as if they are visible, causing great irritation to the eyes and easily causing traffic accidents.

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