1. Which city is the new national standard traffic light?
The new traffic lights have been put into operation in Jiangsu, Shanghai, Hunan, Anhui and other provinces, among which Nanjing, Shanghai and Bengbu are the first trial cities.
The new national standard traffic lights are composed of three rows of vertical lights, with red light in the top row and green light in the bottom row. The left and right sides are indicated by arrows, and the middle is indicated by a disk. The disc light and the direction light will not display green at the same time.
The new national standard traffic lights can increase the traffic efficiency of right-turn vehicles: right-turn vehicles are only allowed to pass when the right-turn light is red. Left-turn vehicles can only turn left when the left-turn light is green, or when the left-turn light is off and the disk light is green.
Second, the design reasons
1. The new national traffic light standard can mention the safety of vehicles, for example, it can increase the efficiency of turning. Although more rules are more complicated, more rules can better restrain vehicles and play a safer role.
2. The traffic lights of the new national standard can optimize the city appearance. With a unified national standard, the national traffic lights can be unified and standardized, which will play a certain role in improving the city appearance.
Third, the history of development
The earliest traffic lights can be traced back to1the beginning of the 9th century. In Yorktown, in the middle of England, carriages often ran over people in front of Westminster Parliament Building in London, England. J. P. Knight, a British railway signal engineer, put forward the idea of designing traffic lights with red and green colors.
The idea soon came true. 186865438+February 10, the first member of the signal lamp family was born in the Parliament Building Square in London. This signal lamp is a gas lamp. The lamp post is 7 meters high, and two lanterns, one red and one green, are hung at the top.
1965438+On August 5th, 2004, American Traffic Signal Company made an electric signal lamp system based on the invention of Lester Wire, a police officer in Salt Lake City. This is the first set of electric signal lamp system put into use in human history. There are only two colors, red and green, and the buzzer will give a warning before turning on the light.
19 18, the first red, yellow and green light appeared in new york-it was a three-color circular four-sided projector installed on a tower on Fifth Avenue in new york. 1920, William Potts, a policeman in Detroit, USA, also invented a patented three-color four-way yellow light traffic light. Since then, yellow light has also appeared in many traffic light invention patents. _
Red, green and yellow are the most suitable colors for signal early warning, which is related to people's visual structure and psychological reaction. The human retina contains rod-shaped photoreceptor cells and three kinds of cone-shaped photoreceptor cells. Rod photoreceptor cells are particularly sensitive to yellow light, while three cone photoreceptor cells are most sensitive to red light, green light and blue light respectively. Therefore, it is the easiest for humans to distinguish between red and green.
In the psychological reaction, the strongest feeling is red, followed by yellow, and green belongs to the cool color system, which has a calming effect; So people are used to using red for prohibition, yellow for warning and green for safety.
legal ground
Road Traffic Safety Law of the People's Republic of China
Forty-fourth motor vehicles passing through intersections should follow the traffic lights, traffic signs, traffic markings or the traffic police's command; When crossing an intersection without traffic lights, traffic signs, traffic markings or traffic police command, you should slow down and let pedestrians and vehicles with priority pass first.