Compared with general highways, expressway has the characteristics of good line shape, high design standard, large traffic flow and fast driving speed. If the advanced management measures are not adopted, traffic accidents and traffic jams are very easy to occur in the case of large traffic volume and bad climate. Therefore, it is necessary to deploy the whole monitoring system on some highways with very large traffic volume. These monitoring systems can monitor traffic flow and traffic operation; Meteorological detection of key points; Timely control of traffic in key sections; Timely find out all kinds of abnormal conditions and take emergency measures to ensure the expressway operation and management at high speed, safety and economy.
    The application of Expressway includes: toll collection system, expressway monitoring system, highway weighing system, license plate recognition system, electronic police system, mobile car capture system and other highway toll system, which consists of several links, such as control traffic lights, railings, verification models, printing bills, displaying vehicle types, charging amount, etc.
    The charge monitoring system mainly observes and records the Toll Station Lane, toll plaza and toll booth, the types of vehicles passing through the toll lane, the operation process of toll collector, and the emergency and special events in the charging process, and implements effective supervision. The road monitoring system mainly monitors the key sections of Expressway such as trunk line, interchange, tunnel, etc., grasps the traffic condition of expressway, finds traffic blocking sections and illegal vehicles in time, and gives timely guidance to ensure the safety and smoothness of expressway. The monitoring and management of video signals in the front highway can be divided into the following layers from the bottom up:
    (1) Toll station: each toll station needs to monitor the local video signal. All the camera signals under the charge station are introduced into the local video monitoring system, and the toll station monitors and manages all local images.
    (2) Monitoring sub center: a highway usually sets several monitoring sub centers for monitoring and managing a certain section. Several upload paths are selected for each toll station image according to the requirements of the road section monitoring sub center. The section monitoring sub center monitors and manages the images uploaded by each toll station in the road section.
    (3) Monitoring center: the unified management of multiple highways is usually divided into several areas according to the region. A district shall monitor and manage several highways adjacent to or connected in a certain area. The monitoring sub centers of these highways upload images according to the requirements of the regional monitoring center, and the regional monitoring center shall monitor and manage the images uploaded by the monitoring sub centers of each section.
    (4) Provincial Monitoring Center: provincial highway administration needs to monitor, manage and dispatch all expressways in the province. Each district monitoring center uploads video signals in its own area to the provincial center, which is monitored and managed uniformly by the provincial center. The provincial center, monitoring center and monitoring sub center are controlled by Internet and hierarchical control. The control signal is forwarded to the equipment to be controlled by the way of step-by-step forwarding.
    In the composition of highway monitoring system, whether it is road monitoring system or toll monitoring system, it can be divided into three parts: front-end camera, transmission link, monitoring room control / display equipment.
The front-end cameras can be divided into the cameras along the road, the cameras at the tunnel entrance, the cameras in the tunnel tunnel and the toll booth cameras, toll lane cameras and toll plaza cameras used by the toll collection system. According to the performance characteristics of front-end cameras, they can be divided into remote control cameras and fixed cameras. The remote control camera includes the camera along the road, the tunnel entrance camera and the toll plaza camera. The fixed camera includes the camera in the tunnel tunnel, the camera of toll booth and the camera of toll lane.
 
    In the selection of transmission link, the transmission is mainly carried out point-to-point, and the specific transmission medium is single-mode optical fiber, multi-mode optical fiber or coaxial cable according to the distance of transmission. After selecting the optical cable, it is necessary to select the optical terminal matching with it.
    The basic items of control equipment in monitoring room include video control matrix, monitor and time delay video recorder. In addition, according to the specific use needs, it can also add projection equipment, video distributor, multi picture splitter, etc.
    The front camera and toll station management office, as well as the toll station management office to the highway monitoring sub center adopt the optical terminal to transmit images. The reason is that the optical fiber resources along the road are sufficient, and the video of traffic conditions on the trunk road is required to have high image quality and good real-time performance, especially the image capture of illegal vehicles. If the compressed image is transmitted through the network, it is difficult to meet the requirements. The toll booth camera is close to the toll station management office, and can be transmitted by coaxial cable or multimode optical terminal. Some optical terminals can also realize the synchronous monitoring of video and sound of lanes and toll booths. At present, the maximum transmission distance is 120 km.
    The image of each toll station management office can be uploaded to the expressway monitoring sub center by using the point-to-point optical terminal or digital node optical terminal to upload the matrix output of the toll station management office to the expressway monitoring sub center. Through the matrix network control of the monitoring sub center, all the toll stations and all the images along the highway can be monitored.
    The ut-6632c serial communication server of Fctel technology can be used in expressway monitoring, which can provide a complete communication solution for toll collection system; The ut-6632c serial communication server is applied in each toll station to connect the equipment in the station; Ut-6632c serial communication server has surge protection or isolation protection function, which is suitable for outdoor communication applications; Installation without setting switch jumper, simple maintenance; Stable and reliable performance, fully competent for continuous non power off applications; Support many common operating systems, a variety of communication methods; Support TCP / IP communication protocol.
    Fctel technology focuses on the R & D and production of optical fiber communication, digital security, video transmission, and security monitoring transmission products, and provides customized services. At present, its products are mainly concentrated in four series: optical transceiver, industrial switch, optical fiber transceiver, protocol converter, etc. Fctel technology, an expert in optical communication and access solutions, can help you to solve the problems of product customization and small and medium batch orders. Choosing Hangzhou Fctel means choosing to be at ease, to be at ease and to be at ease. Welcome to understand and exchange, email：ethan@fctel.com.cn
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