According to the mixing, not only is the driver a newcomer in the tunnel, but many old drivers also call it "often not clear." Chen Weiming, director of the Chongqing LED Lighting Industry R&D Alliance, said that when the driver just entered the tunnel during the day, the brightness of the light outside the tunnel was much higher than that inside the tunnel. If the tunnel was long enough, the driver saw a dark hole. It is a "black hole" phenomenon; if the tunnel is short, a "black box" will appear in front of the driver. This phenomenon, which enters a dark tunnel from a bright exterior and can be seen through a certain period of time to see the inside of the tunnel, is called "adaptation hysteresis". In addition, in the middle section of the tunnel, due to the accumulation of exhaust gases from the car to form smoke, the light of the car headlights is absorbed and scattered by these smokes, affecting the visibility of the obstacles. The exit of the tunnel is much brighter than the inside of the tunnel, which will cause strong glare to the driver and is prone to car accidents.
Therefore, tunnel lighting is not ordinary street lighting. It should change with the brightness of the light outside the tunnel. Chen Weiming said: "When the sun is outside the tunnel, the lighting in the tunnel may be 1000 watts. At night, the tunnel Lighting may be as long as 10 watts.†After investigation, as long as the tunnel is longer than 3 kilometers or the road is longer than 5 kilometers, the price of installing LED lights is similar to that of ordinary sodium lamps, because the corresponding power supply facilities such as cables, distribution boxes and transformers are greatly reduced.
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