Signal lights are about everyone's travel
According to what principle is the signal light duration set?
Today, the Science and Technology Management Office of the Traffic Management Bureau of the Wuhan Municipal Public Security Bureau takes everyone to understand the things behind the length of the signal light!
△ From left to right: Yu Jie, host of China Traffic Radio FM94.8, and Fang Yang, deputy director of the Science and Technology Management Department of the Traffic Management Bureau of Wuhan Municipal Public Security Bureau
What is the principle of signal light setting on urban roads?
Fang Yang, deputy director of the Science and Technology Management Office: Traffic lights guard the safety of life and property, and everyone knows that after the green light in my direction, it is the green light in your direction. The signal light is to release vehicles in different directions through this alternating way, so as to eliminate contradictions and conflicts in the vehicle space with time, thereby ensuring traffic safety. Take Jiukang Avenue and Baihe East Street in Caidian District as an example, this intersection is a full-turn "ten" type intersection, and the release phase is 4 phases (north-south straight, north-south left turn, east-west straight, east-west left turn or 4-phase single-port wheel release), that is to say, A is finished, B goes, and then propylene. If the signal light cycle is 100 seconds, the average division is given to A and A, and A can only be divided into 25 seconds of green light. Traffic lights are very serious and rigorous traffic safety facilities, and there must be a clearance time of 3 seconds of yellow lights and 1 second of full red. The final green light time for the first minute is 21 seconds. Of course, we will also comprehensively consider the traffic flow in all directions, rationally plan the time allocation, and achieve traffic safety and improve traffic efficiency. Secondly, to ensure the traffic safety of vehicles, but also to ensure the safety of pedestrians, then there is a minimum green light time for traffic. The minimum green light time is determined by the distance of the pedestrian crossing, which is calculated according to the normal adult crossing speed of 1.0-1.2 m/ s, although the vehicle has been empty for some periods, but because of the pedestrian crossing reasons, the green light time cannot be shortened arbitrarily.
No.2
Sometimes the signal lights are not lit on heavy rainy days, how should it be reflected?
Huang Chuanming: When the public encounters a traffic signal failure or other electronic facility failure, they can call 122 to report to the traffic management department, and our maintenance personnel will deal with it in a timely manner according to the situation reflected by the public.
△ From left to right: Huang Chuanming, third-level technical director of the Science and Technology Management Department of the Traffic Management Bureau of the Wuhan Municipal Public Security Bureau, and Luo Leisong, first-level technical director of the Science and Technology Management Department of the Traffic Management Bureau of the Wuhan Municipal Public Security Bureau, no. 3
There is no second reader at the traffic light at the entrance of Huaxia College on Guanshan Avenue, and the green light suddenly turns directly to the red light, which is prone to rear-end accidents. How to solve similar problems?
Luo Leisong: The signal light will have a yellow light transition of at least 3 seconds when it changes from a green light to a red light, and there is no sudden change of light. The road traffic signal countdown display is an auxiliary device for signal lights, allowing drivers to have a prejudgment of the status of intersection signal lights, and alleviating traffic congestion has played a certain role. Regarding the fact that there is no second reader at the traffic light at the entrance of Huaxia College on Guanshan Avenue, we will understand the situation on the spot, and if the situation is true, we will urge the jurisdiction brigade to improve the "countdown timer" of the intersection signal.
No.4
It is recommended that Wuhan City be set uniformly and install countdown timers, is this possible to achieve?
Luo Leisong: In fact, at present, thousands of countdown timers in Wuhan cover all the main roads and some branch roads, but because some roads are not delivered roads and have not been handed over to the traffic management department, it is temporarily impossible to rectify and use them. And because it involves a series of factors such as approval process, funds, procurement, installation, etc., the installation of signal light countdown timers requires a process, and these projects are gradually advancing, and the future Wuhan signal lights will be installed countdown. At the same time, Shu Huang reminds everyone that no matter whether the countdown timer is installed at the intersection or not, they must slow down and do not rush and do not rush to ensure the safety of travel with others
In recent years, the number of motor vehicles in Wuhan has surged and the police force is difficult to meet the management needs Wuhan traffic police adhere to science and technology to strengthen the police with the help of Internet technology, solve the problem of urban traffic management For many years, the Wuhan traffic police have taken actual combat as the goal, with data as the main line in the basic work informatization at the same time vigorously promote the construction of the "cloud, network, terminal" series system construction to optimize emergency response, supervision of intelligent application of practical combat efficiency The following is a case:
On May 4, 2019, a white car on the Wuhan Third Ring Road sped in front of the traffic police, and the driver looked nervous. It turned out that the rupture of amniotic fluid of a pregnant woman in the car was very dangerous. At this time, it is the evening peak, what kind of deployment and arrangements have been made by the Wuhan traffic police to turn the danger into a disaster?
Time is of the essence! In recent years, the news that the Wuhan traffic police escort frozen living organs and open the way for the injured is also not uncommon on the Internet, truly practicing the concept of doing practical things for the masses.
In the above video, the traffic police opened the road, the signal light adjustment, the cooperation of the citizens, the original 30 minutes of the journey finally took only one-third of the time to escort the pregnant woman to the hospital, which can be described as opening up a life channel!
No.5
At night, many intersection traffic lights will become yellow lights, is it also controlled by the traffic management department?
Huang Chuanming: We use the signal light intelligent control machine to collect the traffic situation at the intersection, and automatically adjust the signal timing according to the flow. And in different time periods, such as morning and evening peaks, flat peaks, night and late night time to adopt different control schemes, some important intersections of the time division is more detailed, yellow light is only one of the embodiments. In addition, in the face of crisis situations such as escorting frozen living organs and the wounded, we can notify the command rooms of each brigade that while dispatching Han police to ride or lead the way, the information control special class of the command room will centrally control the signal lights at the intersection and speed up the release of vehicles in the direction of the line.
Road traffic signal control, as an effective means to regulate the traffic capacity of intersections and improve the efficiency of road use, is also a powerful means to improve traffic conditions.
Nowadays, improving the ability of road traffic signal control to be "intelligent, modern and scientific" has also become an important topic for the Wuhan traffic police, and the following video will take you to understand the convenience brought by the green wave set up by the Science and Technology Department to the citizens:
No.6
What is the principle of the green wave band?
Fang Yang: In short, the green wave belt is to require the signal control machine to make corresponding adjustments to the starting time of the green light at each intersection through which the traffic flow passes according to the distance of the road section, so as to ensure that when the traffic flow reaches each intersection, it just encounters the "green light" and maximizes the role of the green wave belt in alleviating traffic congestion; we will improve the speed of vehicle travel through the comprehensive traffic management of non-motorized vehicles and pedestrians.
No.7
There are a lot of very good traffic light styles on the Internet, do the traffic police Shu Huang not consider considering updating the style?
Luo Leisong: Netizens mentioned that it should be a "net red signal light" with LED light strips and the color also changes with the color of the signal lights, which has been installed and tested at some urban intersections, and the "net red signal lights" are only suitable for intersections where the left turn and the straight line are released synchronously, and cannot be universally applied.
Influencer signal light
No.8
Is it because these "good-looking" traffic lights are prone to ambiguity and safety risks when identifying traffic participants, so they are not universally applicable?
Luo Leisong: The red, yellow and green in traffic lights cannot be simply understood as expressing the right of way only with color, but also have standard shapes, installation locations and other attributes. The light belt on the light pole is easy for traffic participants to observe the traffic signal indication and confuse with the neon lights of the urban landscape, there is also a certain amount of light pollution, and the "net red signal light" can not clearly express the right of way state of different flows, which will bring certain safety problems to traffic.
No.9
LED flash blindness is a common phenomenon in the city, and it is hoped that the relevant departments can reduce or eliminate the safety hazards caused by the lights.
Qian Qingju: In view of the unreasonable setting of the road traffic monitoring equipment fill light and the problem of high brightness, our bureau is organizing the investigation and rectification of the urban road traffic monitoring equipment fill light. By taking measures such as dimming the brightness of the fill light, increasing the ambient brightness, alternating lane light, etc., the safety hazards are gradually eliminated, and the flash devices that cannot adjust the brightness will be closed or upgraded according to the actual situation.
△ From left to right: Li Jinsong, first-level technical director of the Science and Technology Management Department of the Traffic Management Bureau of the Wuhan Municipal Public Security Bureau, and Qian Qingju, second-level technical director of the Science and Technology Management Department of the Traffic Management Bureau of the Wuhan Municipal Public Security Bureau, No.10
In fact, not only is it LED glare, some trucks install strong lights and electronic eyes on the license plate, so that they can escape the capture of electronic eyes? We still have to ask Qian Qingju to answer it.
Qian Qingju: The strong light will indeed affect the capture of the electronic police, but the installation of strong LED light equipment seriously violates the provisions of the Road Traffic Safety Law, and will be fined 200 yuan and required to be dismantled according to law; if it causes serious consequences, it will be investigated for corresponding criminal responsibility according to law.
Since July, 154 "new electronic police" have been on duty in Wuhan. The electronic police, commonly known as the electronic eye, have done a lot of work in ensuring the safety, orderliness and smoothness of road traffic, and collecting evidence for traffic violations. So how much do you know about the types of e-cops? Let's take a look at a video.
No.11
After watching the video, I don't know if you know more about electronic police? May I ask, does an electronic eye like a spherical shape only shoot a non-stop?
Qian Qingju: The spherical camera can rotate and zoom 360 degrees, mainly shooting various road sections and various types of illegal parking behaviors; gun-shaped cameras are widely distributed at intersections to record illegal acts such as vehicles running red lights, driving without guidance, illegal lane changes, pressing lines, and retrograde; or set up in bridges, tunnels, loops, elevated roads and important nodes of traffic arteries for illegal capture such as speeding or forbidden traffic.
No.12
When the road police are investigating and patrolling, they are not aimless, but will closely rely on the intelligent supervision platform and use scientific and technological means to protect the safety of the city.
Huang Chuanming: With the continuous improvement of the level of traffic management technology, the function of the "electronic eye" is gradually tilted towards traffic data collection and application. All kinds of traffic monitoring, cameras and other equipment on the road can provide first-hand information such as traffic flow, operating conditions, accident scene restoration, illegal vehicle information, etc., providing data support for the improvement of urban traffic management measures, the real-time optimization of intersection signal lights, and the governance of traffic accident hazards.
No.13
Equivalent to an urban transportation big data collector?
Huang Chuanming: It can also be said that we will also combine the popular application of new types of traffic data monitoring equipment, such as lightning integration, electronic tags and other equipment, comprehensively collect full traffic data, strengthen the use of innovative technologies such as edge computing, and provide a strong guarantee for the technology and intelligence of traffic management.
No.14
Wuchang District Wuluo Luo Fifth Lane Kaile Garden No. 5 Gate Intersection, long-term vehicles illegal parking blockage, many times reflected that the problem still exists, can you install electronic eye capture?
Li Jinsong: According to the relevant regulations of Wuhan City, when the construction of the newly reconstructed and expanded roads should be planned synchronously, the supporting electronic transportation facilities should be planned synchronously, and after the road construction is completed and put into use, the traffic electronic facilities will be opened synchronously to capture the illegality. For the public to raise the need to increase the law enforcement monitoring equipment on some roads, we will investigate and investigate the scene in accordance with the work plan, and gradually improve the illegal capture equipment according to the actual situation.
No.15
So what are the rules for setting the electron eye specifically?
Li Jinsong: It is necessary to conduct a prior review with the departments of order management, accident prevention and handling, and legal system, and conduct a comprehensive study of the congestion situation, traffic accident conditions, and traffic improvement measures at the points where the "electronic eye" needs to be set up.
In December 2020, the Wuhan Municipal Government issued the Implementation Plan for Accelerating the Construction of a New Smart City in Wuhan, which proposes the indicators of a 10% reduction in the urban congestion index of Wuhan in 2021 and a decrease of 25% in 2022. Holographic intersections have become the data base for building urban traffic brains, and we will understand them through a video below.
No.16
After watching the video, I can't help but sigh that the current technological development is really fast, so how does the holographic intersection work?
Huang Chuanming: Holographic intersection is the use of intersection radar + electric alarm / bayonet camera two means of perception, coupled with AI + video + radar + edge computing, through radar, video and other multi-dimensional perception technology and intelligent algorithms, to achieve full accident data spatialization, generation of "comprehensive, accurate, real-time, fine" traffic data. The traffic data monitored by the electronic police is also one of the components of the holographic intersection data and the forefront of traffic data collection.
Therefore, the electronic eye is actually the perceptual frontier of urban traffic to help us better grasp the state and changes of urban traffic to provide data support for follow-up congestion control and other work Finally, please ask Fang Yang, deputy director of the Science and Technology Management Department of the Traffic Management Bureau of the Wuhan Municipal Public Security Bureau, to make a summary, talk about the continuous development of these transportation technologies to the travel of citizens, the overall traffic of the city will bring about changes.
Fang Yang:
First of all, let me introduce you to our Technology Management Office. Our Science and Technology Division currently has 25 civilian police officers and 12 police auxiliary personnel. Among them, there are 1 person with doctoral degree and 9 people with master's degree, 2 senior engineers, and 2 specially appointed experts in public security traffic management in the province.
In October 2014, the Wuhan Municipal Bureau of Human Resources and Social Security jointly established the Wuhan Postdoctoral Innovation Practice Base with Huazhong University of Science and Technology and Wuhan University.
In recent years, in terms of traffic management technology innovation, we will integrate big data analysis, cloud computing, Internet of Things, artificial intelligence and other scientific and technological means into traffic management, apply intelligent traffic light management system, through "the road network can be calculated, people and vehicles can be measured, dynamic and static combination", real-time perception of road conditions, dynamic distribution of right of way, intelligent guidance of traffic, and strive to create a digital, networked, visualized, intelligent road traffic management model.
In the future, our Science and Technology Department will deeply implement the strategy of strengthening the police with science and technology with innovative ideas and thinking, vigorously promote scientific and technological innovation, strive to improve the level of informatization, scientificization and modernization of public security traffic management work, and continuously enhance the people's sense of security and happiness in travel.
| more questions |
Q: Is it appropriate to install two traffic lights in just a few tens of meters on a road?
A: When we set up traffic lights, we will implement them according to the basic situation of intersections and road sections and the form of traffic organization. In order to ensure the continuity of motor vehicle passage and reduce the number of stops of vehicles, we generally do not continuously set up traffic lights within a relatively close distance.
However, some intersections are relatively close, such as the Zhongnan junction and the T-shaped bridge intersection of Wuluo Road, the intersection of Jiefang Avenue on Huangpu Avenue and the crosswalk of 161 Hospital. These areas are very large because of the flow of traffic and people, if you do not install traffic lights will affect the traffic safety and smoothness. Therefore, we have also installed traffic lights in such intersections that are very close to each other.
Although the signal lights are relatively close, we will develop a signal control linkage control scheme through traffic control technology, and coordinate the control of the signal lights through the communication between the signal lights; similarly, in many road sections where the traffic lights are relatively dense, we will also use the "green wave" control method to coordinate the control of multiple intersections. Through the coordination between the signal lights, the smooth passage of the vehicle can be effectively guaranteed and the number of vehicle stops can be reduced.
Q: Why is it that in very short sections, the signage with the same content is installed on the high members and the low members, which is very messy.
Answer: The presence of signage members in the past few years is indeed more common, like more construction sites, the supply and demand of parking in the old city is unbalanced, and the construction projects and the brigades in the jurisdiction will have repeated signs in order to standardize the driving and parking order.
However, in recent years, with the continuous development of the work of "clearing the card and reducing the bar", we have further standardized the setting of various types of signs in accordance with national standards, and this situation has also been alleviated. If citizens also find similar situations, they can reflect 12345.
Q: Driving on the road, I found that there were many traces of being hit on the bridge ramp on the bridge, and there were reflective cursors but no effect, can you increase the safety signs and remind everyone to pay attention? A: In order to reduce the hidden dangers of accidents, in general, we will set up integrated flash warning lights, various warning signs, anti-collision water toilets and other security settings to reduce the occurrence of accidents. In view of the lack and damage of facilities, we will urge the responsible units to strengthen the inspection of facilities, and update and improve the damaged and missing facilities in a timely manner.
Q: Is the blue marking line on the road in Wuhan City a mistake?
A: This blue marking line is called the edge line of the non-motorized road, according to the GB5768-3-2009 national standard definition: the blue marking line as a non-motorized special lane marking line; in principle, this non-motorized road marked with a blue line is only for non-motorized vehicles, pedestrians and motor vehicles can not drive in; when the blue line is marked as a parking space, the free parking space is indicated.
Source: China Traffic Broadcasting Hubei Frequency FM94.8 《Han Police Say Traffic》