The scientific basis of the light color of the traffic signal
Release time：
2023-03-02 13:53
Source：
In the earliest days, there were only two colors, red and green, and later, after improvement, a yellow light was added. Red light means stop, yellow light means ready, and green light means pass. The reason why these three colors were adopted and used as traffic signals is also related to people's visual structure and psychological response.
The human retina contains rods and three kinds of cone photoreceptor cells, the rods are particularly sensitive to yellow light, while the three kinds of cone cells are most sensitive to red light, green light and blue light respectively. Because of this visual structure, people can most easily distinguish between red and green. Although yellow and blue are also easy to distinguish, but because the eye is sensitive to blue light less photoreceptor cells, so to distinguish the color, or red and green is better.
Traffic signals are not set at random.
According to the principle of optics, red light has a long wavelength and strong ability to penetrate the air, and it attracts more attention than other signals, so it is used as a signal to prohibit traffic, and green is used as a signal to notify because the difference between red and green is the greatest and easy to distinguish (red-green blindness is a minority after all). In addition, color can also express some specific meaning, to express hot or violent words, the strongest is red, followed by yellow. Green has a cooler and calmer connotation. Therefore, people often use red to represent danger, yellow to represent warning, and green to represent safety.
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The history of signal light development
In 1858, a mechanical wrench type signal in red and blue with coal-fired gas as the light source was installed in the main street of London, England to direct carriages to pass. In 1868, British mechanical engineer Naite installed the world's earliest gas traffic light in the square in front of the Palace of Westminster in London.
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In the intersection, four sides are hanging red, yellow, green, three color traffic signal, it is silent "traffic police". Red and green lights are the international unified traffic signals. Red light is the stop signal, green light is the signal to pass. Intersection, several directions to the car are gathered here, some want to go straight, some want to turn,
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