Traffic light tips

Road traffic lights are a category of traffic safety products, which is an important tool to strengthen road traffic management, reduce the occurrence of traffic accidents, improve road use efficiency and improve traffic conditions. Suitable for cross, T and other intersections, controlled by road traffic signal control machine, guide vehicles and pedestrians to pass safely and orderly.

The main types of traffic lights are: motor vehicle lane lights, crosswalk lights (that is, traffic lights), non-motor lane lights, direction indicating lights, mobile traffic lights, solar flashing warning lights, toll station ceiling lights.

Traffic light is an important part of traffic signal command and is the basic language of road traffic. The traffic light is composed of red light (indicating that traffic is prohibited), green light (indicating that traffic is allowed), and yellow light (indicating warning). Divided into: motor vehicle signal light, non-motor vehicle signal light, pedestrian crossing signal light, lane signal light, direction indicating signal light, flashing warning signal light, road and railway level crossing signal light. Widely used in highway intersections, bends, Bridges and other dangerous sections with safety hazards, to direct drivers or pedestrians to traffic, promote smooth traffic, to avoid traffic accidents and accidents.

Traffic light is an important part of traffic signal command and is the basic language of road traffic. The traffic light is composed of red light (indicating that traffic is prohibited), green light (indicating that traffic is allowed), and yellow light (indicating warning). Divided into: motor vehicle signal light, non-motor vehicle signal light, pedestrian crossing signal light, lane signal light, direction indicating signal light, flashing warning signal light, road and railway level crossing signal light. Widely used in highway intersections, bends, Bridges and other dangerous sections with safety hazards, to direct drivers or pedestrians to traffic, promote smooth traffic, to avoid traffic accidents and accidents.

At the earliest, there were only red and green two colors, and later after improvement, a yellow light was added, the red light indicated stop, the yellow light indicated ready, and the green light indicated passage. The reason why these three colors are used, on the one hand, the three primary colors, and other colors are also raised on this basis, on the other hand, the use of these three colors as traffic signals is also related to people's visual structure and psychological response.

The human retina contains rods, which are particularly sensitive to yellow light, and three types of cones, which are most sensitive to red, green and blue light. 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 less sensitive to blue light photoreceptor cells, it is better to distinguish colors with red and green.

This shows that the traffic lights are not randomly set.