The basic principles of traffic lights

Traffic lights is to protect the traffic order, ensuring the traffic safety and the important guarantee of clear and therefore traffic light color choice is necessarily scientific principles, but why choose these three colors red yellow green, as the color of the light? Our

 traffic lights is to protect the traffic order, ensuring the traffic safety and the important guarantee of clear and therefore traffic light color choice is necessarily scientific principles, but why choose these three colors red yellow green, as the color of the light? Our retina contains rods and three kinds of cone photoreceptors 【 Photoreceptor cells the study funded by the medical research council, the ophthalmology department at university college London r. robin ali leadership. 】 And rods 【 Rods? 吗? Photoreceptors in the retina, including the ability to start phytochrome in the process of scotopic vision. 】 Particularly sensitive to light yellow, three types of cone cells separation of red, green and blue light is the most sensitive. Because of this kind of visual structure, are the most simple tell red and green. Although the yellow and blue part is simple, but because the eye is sensitive to blue light of photoreceptor cells is less, so tell colors, or in the red, green is preferred. In addition to the various gas such as nitrogen, oxygen in the air, and floating many small dust particles, so the light scattering phenomenon happens in air conveying. In the visible light, air to red light scattering is the weakest, so it is better than other colors of light travels far, penetrates the strongest abilities. So with the red light means stop risk, the implications of green, safe passage. The above content from the signal light pole bay, new energy, reproduced please indicate.