Highway traffic monitoring system is an important part of the highway traffic electromechanical system, its main function is to observe the modern traffic flow with the help of the relevant theories, induction and control, and the use of computer technology, closed-circuit television monitoring technology, information multimedia technology and other areas of the latest scientific and technological developments, the highway traffic operations, vehicle traffic and the road environmental conditions for the Comprehensive observation and effective guidance and control of vehicle routes and traveling modes along the highway.
Main Functions
The computer management system of road monitoring center (sub-center)
Mainly includes two components of system hardware and software, of which the computer hardware mainly includes: database server, business computer, graphic computer, router, switch, printer, etc.; the software system mainly includes: system software, support software, and business management software. Software system mainly includes: system software, support software and business management software. The computer management system can complete the status query, information acquisition, function setting for the field equipment along the road; the comparison and preference of traffic management scheme, the determination of traffic control parameter; the information **** enjoyment of road administration, public security, medical and other related departments and the collaborative handling of emergencies; the printing of reports, daily information management and other functions;
Information Acquisition System
The system is used for The collection of traffic and environmental information along the road, the collection methods are mainly manual collection and automatic collection. The main equipments include Emergency Telephone (ET), Vehicle Detector VD (coil type, video type, microwave type), Weather Detector (WD), etc.
Information Distribution System
It is used for the distribution of road traffic guidance and warning information, and the main equipments include Gantry Intelligence Plate (CMS), Pillar Intelligence Plate (SCMS), Variable Speed Limit Signs (CSLS), etc.
Close Circuit System
Close Circuit System
Close Circuit System is used for the collection of traffic and environmental information along the road, and there are mainly two types of collection methods: manual collection and automatic collection. /p>
Closed-circuit television surveillance (CCTV) system
The main equipment includes the front-end video capture camera (usually also contains a PTZ, shield, decoder, etc.), the transmission of video (data) multiplexing optic fiber-optic converter, center (branch) video switching control matrix and the corresponding code conversion equipment, hard-disk video recorders, large screen projection, monitors, etc.;
Lightning and grounding system
Lightning protection and Grounding system
For the protection of monitoring equipment from lightning strikes and operational overvoltage damage, including lightning rods, power supply lightning, signal lightning, grounding lead and grounding electrode;
Power supply and distribution system
For the center and field equipment for the supply and distribution of power, including uninterruptible power supply (UPS), power regulators, distribution boxes (cabinets), power supply cables, etc., for the system.
Tunnel monitoring system
Tunnel monitoring system in addition to the road monitoring system contains various functions and subsystems, but also contains the following functions and subsystems specific to it.
Tunnel Ventilation Control System
For tunnels distributed along the route, especially long tunnels, there is usually a ventilation and lighting system, of which the ventilation system mainly includes jet fans, carbon monoxide/visibility detectors (CO/VI), ventilation control box (equipped with PLC, soft starter, relay, etc. according to the need), power supply cables, etc., which is used for the exchange of air and pollutant concentration control both inside and outside the tunnel. and pollutant concentration control.
Tunnel Lighting Control System
Tunnel lighting system is installed because traveling in tunnels, especially in long tunnels, can produce "black hole" or "white hole" effect, which affects the safety of traveling. The equipment mainly includes center pole lamps for approach lighting, tunnel lamps for general lighting inside the tunnel, emergency lamps for power failure or fire and other emergencies, as well as brightness detectors, lighting control boxes (equipped with intelligent lighting controllers, PLCs, relays, etc., as needed), fire-resistant or flame-retardant cables, and so on.
Fire alarm system
The main function is to complete the timely detection and alarm of fire in the tunnel. The main equipment includes fiber optic fire detector, dual-wavelength fire detector, metal fire detector (copper pipe) and the corresponding alarm control processing host; when a fire occurs with manual alarm or automatic detection of fire, there are sound and alarm signals on the fire alarm workstation at the monitoring station and the location of the fire alarm is displayed, and the camera monitoring screen at the location of the fault is displayed on the monitor through the closed-circuit television subsystem automatically. monitor, and can be linked with the water system, open the sprinkler equipment to extinguish the fire.
Traffic control system
It is mainly used to control the status of traffic signals and lane markers in the tunnel as well as linkage with the ventilation and lighting control system. The main equipment includes: traffic signal lights, lane indicator signs, tunnel controller (PLC), etc.; of which the tunnel traffic monitoring local controller system is the link between the tunnel monitoring office and the tunnel field equipment. Each local controller is connected via industrial Ethernet to form a ring system. Local controllers are connected downward in a one-to-many manner with the decentralized field equipment in the tunnel to collect, store and manage the field equipment data, monitor the working status of the field equipment, report to the monitoring office, receive commands from the monitoring office to control the field equipment, and in addition, it has the function of local automatic control, which can be controlled by the local controllers inside the tunnel when needed for maintenance, testing, and so on.
Broadcasting system
It is mainly used for broadcasting in and out of the tunnel through the monitoring sub-centre when there is an emergency such as traffic obstruction, traffic accident or fire in the tunnel, commanding and scheduling, traffic diversion and organizing rescue, etc. The main equipment includes a console, a horn, a horn, a horn, a horn, a horn, a horn, a horn, a horn, a horn and a horn. The main equipment includes console, horn speaker, power amplifier and so on. Usually take and emergency telephone system comprehensive use of the way, that is, tunnel broadcasting system and emergency telephone system *** with a control host, *** with the same software platform; comprehensive use of the same transmission fiber optic cable as a transmission medium; emergency telephone in the tunnel can be notified to the monitoring and control center of emergency information, but also can listen to the tunnel tunnel broadcasting effect. The broadcasting system does not affect the normal use of emergency telephones.
The above is the construction network on the highway traffic monitoring system information.
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