Red, yellow, green traffic lights: why do you want to use 3 kinds of color? - China lighting network

Red light stop, green line, yellow lights up wait for a while, 'is everyone to learn and obey the traffic rules at an early age. However, few people to think, why the traffic lights are red, yellow, green three colors, and do not use any other colors? Small make up today to lead everyone to discuss this problem. The origin of the light, in fact, the traffic lights first appeared in Britain in the 19th century, in order to reduce the carriage rolled one accident. Was adopted by the gas lamp, not only need to change color, manual operation, also has a very high instability soon because of the explosion was discontinued. And then, in 1914, the United States in Cleveland, light to light new form again. And in 1918, Chinese scholars in the United States adopted Hu Ruding proposal to join the yellow light, to tip before the light changes. Why, then, red, yellow, and green three colors can be the most suitable for the color of the light? Human visual function structure of the retina contains rods and three kinds of cone photoreceptors, and rods is extremely sensitive to light yellow, three types of cones are sensitive to red, green and blue, respectively. As a result, humans can easily distinguish between red and green. The yellow and blue also can distinguish, but the eye itself on blu-ray photoreceptor cells less some, for security, there is no use. People's psychological response of color red gives a person the feeling is the strongest, often used to represent prohibited or dangerous. And red light of the strong penetrating power, in the cloudy day of rain or fog weather is easy to see. Yellow is a soft warm color, can give a person a kind of slow, the visual effect of the buffer, a sign for people waiting. And green, belong to cool color department, able to calm the heart, and often represents a safe, peaceful, so it can be said to traffic. Seemingly obscure traffic lights, but has experienced the change of The Times, looking for better every traveler's life safety. Drivers driving out must abide by the 'red light stop, green line' of the traffic rules, jointly maintain good traffic order. YanZhiXiang

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