Introduction of urban road system

The urban road transportation system is mainly composed of road network system, traffic flow and traffic monitoring and control system. Road network system is the carrier of traffic flow operation, traffic detection and control system to guide the traffic flow through the road network in an orderly manner through the conflict points. Road network system and traffic monitoring and control system is like a control valve between ditch and ditch, through the control of the valve, control the traffic flow on the road through the road network nodes in an orderly manner, and ultimately make the individual vehicle to reach its driving destination.

The road network system of the city mainly consists of roads and intersections. Roads in cities can be divided into expressways, trunk roads, secondary roads and side roads. Expressways and trunk roads are the backbone of urban transportation, ensuring the connectivity of various regions of the city, while the function of secondary roads and feeder roads is to assist the trunk roads and ensure the accessibility of the regional road network. The intersection of urban road system is the conflict point of the urban road system, all directions of traffic through the area at the same time will occur on the plane of the conflict, this conflict needs to be coordinated through the intersection of the signal control to intervene, so that the different direction of the vehicle efficiently and orderly through the intersection.

Urban traffic monitoring and control system mainly has urban road monitoring function and intersection and expressway entrance signal control function. Urban road monitoring function, access to urban road traffic running conditions, to judge, signal control function as the basis for the development of the corresponding control signals, and through the intersection of the traffic light output complete signal control. Urban traffic monitoring equipment is similar to the human body's eyes and ears and other functions, collecting information from the outside world, through the processing of the brain, and finally through the terminal output. Urban road traffic monitoring and control system is equivalent to the urban road traffic system like the central nervous system, responsible for the control and coordination of urban traffic flow operation.