why are red, yellow, and green chosen for traffic signal lights?

Traffic signal lights are a kind of product that we often see. For example, the traffic lights we see when crossing the road are one type of traffic signal lights, which mainly consist of red, yellow, and green colors. However, in our perception of colors in daily life, we know that there is an enormous variety of colors, and they can be said to be all-encompassing. But why are red, yellow, and green chosen for traffic signal lights?

The reasons why red, yellow, and green are chosen for traffic signal lights are as follows:

1. It is related to people's emotional connotations of colors.

Colors also have the meaning of activity. To express heat or intensity, red is the most powerful, followed by yellow, and green implies a cooler and calmer feeling. Therefore, people often use red to represent danger, yellow to represent caution, and green to represent safety.

2.It is related to the structure of human visual functions.

The human retina mainly contains rod-shaped and three types of cone-shaped photoreceptor cells. The rod-shaped cells are particularly sensitive to yellow light, and the three types of cone-shaped cells are most sensitive to red light, green light, and blue light respectively. Due to this visual structure, people can most easily distinguish between red and green. Although yellow and blue are also relatively easy to distinguish, because there are fewer photoreceptor cells in the eye that are sensitive to blue light, it is still better to use red and green for color discrimination.

3.It is related to people's psychological reactions.

In the past, traffic signal lights only had red and green lights. After improvement, the yellow light was added. The red light indicates stop, the yellow light indicates preparation, and the green light indicates go.

Hu Ruding, the inventor of the yellow signal light, was standing at a busy crossroads one day waiting for the green light signal. When he saw the red light and was about to cross, a turning car passed by with a whoosh, giving him a big fright. Back in his dormitory, he thought about it over and over again and finally came up with the idea of adding a yellow signal light between the red and green lights to remind people to pay attention to the danger.

4.It is related to physical properties.

Among the seven colors of red, orange, yellow, green, cyan, blue, and purple, red has the longest light wave. The longer the light wave, the greater the ability to penetrate the surrounding medium. Red light has the strongest penetrability. The light of other colors is easily scattered and is not easy to be seen in foggy weather. However, red light is the least likely to be scattered. Even when the air visibility is relatively low, it is easy to be seen, and traffic accidents can be avoided. Therefore, red is used to indicate prohibition in traffic signal lights.

Through the above introduction, I believe everyone should have know why red, yellow, and green are chosen for traffic signal lights. Of course, in daily life, we also need to have a thorough understanding of the traffic signal light traffic rules so that our daily travels can be safer.

About Shenzhen Starlight Road Technology Co., Ltd.:
Established in 2011, Shenzhen Starlight Road Technology Co., Ltd. is a national high-tech enterprise specializing in the R&D, production, and sales of intelligent traffic products. With 15 years of dedication and relentless effort, the company has accumulated extensive experience. Its main products include:

• Intersection Smart Networked traffic Signal Controller with english operation interface
• Single-Point Intersection Traffic Signal Controller
• LED Traffic Signal Lights
• LED Countdown Timer
• Smart Crosswalk Alert Beacon
• Integrated Traffic Signal Lights
• Sectional Pedestrian Crossing Request System
• Voice Prompt Device (Blind Clock)
• Mobile radar speed check sign
• Solar-powered radar speed feedback sign
• Solar-powered radar speed sign with vehicle license plate recognition
• Portable solar-powered traffic signal light
• Solar-powered warning traffic signal light
• Smart zebra crossing Road-embedded cast iron road stud
• LED Smart crosswalk Road-embedded cast iron Block
• Smart zebra crossing pavement-embedded pedestrian signal light
• LED Canopy Warning Signal Light
• LED Traffic Guidance Display Screen
• Smart Curve Safety Detection System

In addition, Starlight Road traffic signal lights are sold overseas. For example: traffic signal lights in Cancun, Mexico; traffic signal lights in Oaxaca, Mexico; traffic signal lights in Guanajuato, Mexico; traffic signal lights in Bangkok, Thailand; traffic signal lights in Chiang Mai, Thailand; traffic signal lights in Riyadh, Saudi Arabia; traffic signal lights in Jeddah, Saudi Arabia; traffic signal lights in Kuala Lumpur, Malaysia; traffic signal lights in Penang, Malaysia; traffic signal lights in Vietnam; traffic signal lights in Indonesia; traffic signal lights in Cambodia; traffic signal lights in the Philippines; traffic signal lights in Laos; traffic signal lights in Myanmar; traffic signal lights in Brunei.

For more information on intelligent traffic solutions, please visit the Starlight Road ITS official website: //www.starlightroadits.com/ or contact us via email.