In the research and development of intelligent transportation systems, the construction of traffic LED induced screen is one of the main means to solve traffic congestion, ensure traffic safety and improve the efficiency of traffic network use. The role of the traffic guidance screen is to receive the real-time dynamic status of road traffic and the command and dispatch instructions of the traffic management department, and display various notifications and guidance information that can induce road traffic flow in time, effectively induce traffic flow, and reasonably control and balance. The distribution of traffic flow improves the utilization rate of existing roads and provides good services for drivers to drive safely and quickly.
The induction screen is a multi-function information display screen composed of a combination of an ordinary road sign board and a variable information sign. According to the layout of the LED on the whole induction screen, it is divided into a partial LED induction screen and a full LED induction screen. The partial LED induction screen provides the driver with the road direction ahead in a graphical manner showing the overall route contour of the road, and has the function of guiding the road sign. The road marking area of ​​the static graphic is embedded with an LED variable light band to indicate the road condition of each fixed road section. The full LED induction screen fills the LED lighting tube with a certain density in the whole plane, and displays the road condition and text information by controlling the lighting of the specific LED lighting tube through a dedicated computer or MCU. In addition to displaying the induction information, the all-LED induction screen can also be used as a platform for urban emergency information, instant information, and publicity information. The induction screens of these two modes are illuminated by different colors of LEDs, and the real-time road conditions of these sections are in smooth (green), blocked (red) or crowded (orange) state, for the driver to judge and select the appropriate driving route. , plays a role in traffic guidance.
In order to exert its inductive effect, the LED-induced screen generally needs the coordinated processing of the following systems: one is the basic traffic information collection and processing; the second is the induction information generation; the third is the induction information release.
First, the collection and processing of basic traffic information
Basic traffic information can be divided into two categories: dynamic information and static information. Dynamic information mainly refers to traffic data that changes with time, such as traffic flow, average speed, congestion status, and accident status on the road. It is generally derived from various road detectors such as toroidal coils, microwave detectors, video detectors, and letters. Marked vehicles, etc., or manual reports, such as telephone alarms, traffic patrol reports, etc. Static information mainly refers to road status data that does not change with time, such as electronic map information of roads, detectors and various traffic management, installation and configuration information of control equipment. Basic traffic information collection relies on various types of testing equipment, including toroidal coils, microwave detectors, video detectors, beacon vehicles, and GPS vehicle-mounted information.
Second, the generation of traffic guidance information
The generation of the induced information is divided into manual and automatic according to the generation method. Artificially induced information generation is based on traffic conditions and road conditions, combined with past experience, to select appropriate guidance information, manual input system, which is a relatively low-level use of traffic guidance information systems. The automatic generation of induced information is the core of the intelligent traffic guidance information system. It is mainly based on dynamic traffic flow distribution optimal control models and algorithms, traffic flow prediction models and algorithms, and other complex traffic analysis models and algorithms. Generate induction information, which is a relatively advanced use of traffic guidance information systems.
Third, the release of the induction information
The inductive information is released in a step-by-step manner depending on the recipient of the information. The induction screen publishing system divides several types according to the type, size and number of screens of the induced screen, and releases the induction information to the outdoor LED display on each road, which is also the main release of the traffic guidance information widely developed and adopted at present. the way.
However, the above process is caused by the collection and processing of traffic information, the generation of traffic-inducing information, and the release of induced information. No matter which link requires time and more complicated operations, the error and release delay are the drawbacks of traditional induced information systems. Nowadays, the induction system urgently needs a more convenient and faster processing process. This paper proposes a new form of induction information release based on practical application. The control center presets the information into the memory of the induced screen control system through GPRS or optical fiber. The local LED and the full LED induction screen, the control software and the control method are essentially different, and the corresponding control is written in different induction screens. The software can be controlled directly by the center control or directly by the police on duty. During the rush hour of the city, there are police officers on duty. The police collect traffic traffic information directly, generate induced information on the spot, and control the screen content by remote control to prompt, accurate and rapid. The traffic flow control is given in the first time, which can more efficiently divert vehicles and relieve traffic pressure.
In short, due to the rapid development of many large and medium-sized cities, the traffic on the roads is becoming more and more crowded, indicating a smooth road for the driver, which can greatly alleviate the traffic pressure. It has a visual display and a relatively short viewing time. The LED-inducing screen, which has a large amount of advantages and can be used to guide the driver who is not familiar with the road conditions, is increasingly important in the dense network of urban roads and highway main trunk lines.
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