One of the debates about how to safely drive in bad weather is the use of lights, especially fog lights. Today we focus on the fog lamp, whether you know it or not you must know. What is the role of fog lights? Do not rush to throw in disdain eyes, many drivers do not answer. Here is a unified answer: First, supplement the lighting in rain and fog; Second, let the people around you find your existence. The first point is well understood, but the second point, many people do not realize, so the next few questions: when fog lights, when can not be opened, what is the reason ... ... naturally can not answer. So, the following answers these questions: What is the principle of fog lights? Fog lights are used under low visibility conditions and must have sufficient penetrating power. Before speaking about the principle of fog lamps, the “up posture†is first: the air is an aerosol, and all kinds of tiny water droplets, suspended particles, and other “impurities†fill it. The light emitted by the headlights must pass through these impurities to reach the ground. Since it is an aerosol, the light passing through the headlights will inevitably produce the “Tyndar effectâ€, which is a phenomenon in which the parallel light rays diffract a bright light beam when passing through the air. When the weather is fine, these "impurities" are harmless and we will not notice. However, when visibility is low, it is different. The lights of ordinary headlights are brought together, and it is difficult to penetrate dense fog and vapor. High-intensity light hits the fog. The Tyndall effect is very obvious. The result was a white day in front of me, and I couldn't see anything on the road surface. This is the reason why fog lights cannot be used in high fog days. The intense and concentrated light of high beam lights can make the front fog become a bright “wallâ€. The principle of the "Tyndar effect" is the wavelength of visible light in some bands, which coincides with the aerosol particles, and produces diffraction, so that parallel rays cannot pass straight through. Therefore, the best way to weaken the "Tyndar effect" is to make the light source try to avoid these bands. The longer wavelength of the fog lamp can minimize diffraction and allow more effective light to pass through dense fog and tiny drops of water. At the same time, the lights of the fog lamps are divergent rather than parallel and do not converge like headlights. Light does not converge and the Tyndall effect will not be amplified. In simple terms, the fog lamp has been specially designed. It has two major advantages: first, it has strong penetrating power and high recognition; second, it will hardly produce the Tyndall effect, and light will not hit the fog and obstruct the line of sight. Can also illuminate the near ground. This is the key to distinguish fog lights from other lights. Why are the colors of fog lights different before and after? Regardless of front and rear fog lamps, the principle is actually the same. Why is the color of the fog lights different before and after? This is the so-called "specific case analysis." Let us talk about front fog lamps. In the past century, fog lights in front of vehicles were generally yellow because the wavelengths of red and yellow light were long and penetrating power was strong. Red was already used as a tail light, so yellow became the first choice for fog lamps. . However, this idea is not applicable today. We know that new cars and fog lamps generally use white light sources. On the one hand, it is for the sake of beauty. On the other hand, halogen headlights are white. To get yellow light, yellow lights must be used to filter out yellow light, which may only result in a light transmittance of about 30%. In this case, the actual power of fog lamps is greatly reduced. The manufacturing technology of halogen bulbs is now much more advanced than before, and the "variegation" of light sources is much less than in the past, and the Tyndall effect is not obvious. Therefore, the use of a white light source is the choice between aesthetic and practical power. Why do not the fog lamps use white afterwards? Because the reversing lights have been "first-passed", in order to avoid misunderstandings, they switched to red as the light source. After all, it's not a big problem to think of the rear fog lights as taillights or brake lights (the three types of lights have the meaning of “keep the distance from the car, point away from meâ€). Moreover, the conditions for opening the rear fog lamps are met, which is also the taillights cannot be worn. When the fog is through, the rear fog lamp should be added to the taillights. If a white light source is used, in the foggy day, the rear driver will use the reversing light as a rear fog lamp. In order to solve the problem of insufficient light transmittance, and in order to distinguish it from ordinary taillights and brake lights, the brightness of the rear fog lamp is very high. The power of the halogen fog lamp is the same as that of the brake lamp, which is 21W (LED taillights are different, but the brightness is also different. Subject to regulations, the difference is that fog lamps are more regular scattered light sources that look dazzling when visibility is high. The brake light is an irregular diffuse light source that does not dazzle the driver at all times. So, in other words, the rear fog lamp has only a good brightness when it is used in rain and fog. When do you use fog lights and when can't you use them? Due to this special principle of the fog lamp, it is determined that it has a certain range of use. First, the light source of the fog lamp has no directionality and is similar from all angles. When the fog is separated, the light intensity is just right. In this way, the fog lamp plays a role in increasing the degree of recognition. When the visibility returns to normal, the high brightness and scattering characteristics make the fog lamp a very dazzling light source. At this time, the fog lamp should be turned off without hesitation. Second, in the rain and fog, fog lights are not readily available. Regarding how it is used, let's take a look at the official statement of the Ministry of Public Security: When the visibility is 200m-500m, the low beam, width and taillights must be turned on, and the speed should not exceed 80kmh. The distance between the vehicle and the preceding vehicle in the same lane must be more than 150m. When the visibility is 100-200m, the fog lights, low beam lights, width lights and taillights must be turned on. The speed should not exceed 60kmh, and the distance from the front vehicle should be 100m or more; When the visibility is 50-100m, the fog lights, low beam lights, width lights, and taillights should be turned on. The speed should not exceed 40kmh, and the distance to the front vehicle should be 50m or more. When the visibility is less than 50m, the traffic control department of the public security department will take traffic control measures to close the expressway in local and all road sections in accordance with regulations. In other words, fog lights have only come into play when the visibility is less than 200m. There are two reasons: First, when the visibility is greater than 200m, the headlights, width indicators, and taillights can provide sufficient lighting and warning effects. Second, the fog at this time can make the fog lights soft, and the line of sight is poor and requires fog. Lights as supplementary lighting. Which is more "conspicuous" for rear fog lamps and double flash lamps? In the bad weather on the highway, many drivers could not wait to open the double flash. Many people even have such a mentality. They have opened up double flashes and think that they are the "privilege vehicles" for people. They frequently interweave with high speed and heavy traffic in heavy traffic and heavy rain. We do not take the time to condemn this behavior, but there are only three issues worth discussing: 1. Do double flashes apply in rainy and foggy weather? Second, do not open a double flash but do not open the fog lights, this time do not need fog lights when? Third, how to do when you open a double flash and change lanes? Double flashing lights are bright yellow, and the color is close to the past fog lights. It makes people think that it is all right to drive in the rain and mist. In fact, the double flash just looks "conspicuous" and the actual effect cannot be compared with the fog lamp at all. First of all, it did not go through a special design like a fog lamp. The light emitted was irregular scattering like a taillight, rather than a regular radial pattern. Second, its brightness was far less than a fog lamp. These two points lead to double flash in terms of penetrating power than fog lights. Here are a few pictures I took on the high-speed highway (dangerous action, no imitation). No car in the above picture has opened a fog lamp. The Jeep in the middle lane just opened the width and taillights. It was already too much more visible than the next two cars. It shows how important the lights are in bad weather. In this photo, the car in the middle lane opened after the fog lights, it became the most dazzling "star" of this section of the road, there is a "phantom car" on this road, what lights did not open, carefully look for Where is it? There are no lights in the rain, and the consequences can be quite large or small. This last one should be able to refute the views of many people. Is the double flash and the rear fog lamp more conspicuous? In this picture, the distance between the two cars in front and the shooting car is roughly the same. It is obvious that the only rear fog lamp of the black car is even more prominent than the two double flashes of the white car. This is the “power†of the fog lamp. The light source and brightness of fog lamps are more suitable for low visibility weather than double flash. Double flash function is to indicate danger and temporary parking, the role of the turn signal is lost after opening. With twin flashes instead of fog lights, the safety of the fog lights did not play, and the drawbacks of double flashes were revealed. It was actually a stupid move to lose watermelons and sesame seeds. Therefore, when you drive through dense fog and experience heavy downpours at high speeds, the correct course of action is to maintain a reasonable speed, turn on low beams and front and rear fog lights, in addition to making your sights as good as possible, but also make it easier for others. Perceive your presence, car distance between you. But don't be far away. The high beam lights up in the mist, and the white flower is more dangerous. And under such weather conditions, you are obliged to reduce the speed to a range suitable for using low beams. Driving on the road is actually the process of each driver’s interaction. In a word, the correct use of lights can greatly reduce traffic accidents. It is just as important for others to see and see the way for themselves. This is an irrefutable truth.
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About fog lights, there are several major issues that must be clarified