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The role of traffic control
- Dec 07, 2018 -

The role of traffic control

Traffic control for the organization, command and control the flow of traffic flow, flow, velocity, maintain traffic order, etc all have important role, from the time will be conflicting traffic flow separation, to make it through and at different times, in order to assure safety, forcing orderly traffic through the intersection at the same time, improve the efficiency and capacity, through the intersection and reduce the noise, reduce the automobile exhaust pollution to the environment. [1]
Traffic control mode selection
(1) estimation of occupied land and traffic capacity in different types of three-dimensional cross-planning;
(2) according to the traffic volume and accident situation;
(3) different management modes, different levels of intersections and different forms of horizontal intersections have different capacity;
(4) according to the nature and type of intersection road;
(5) other factors. [2]
The content of traffic control
(1) traffic control at intersections
Regardless of priority rule control or signal control, vehicle delay at intersections increases with the increase of traffic flow. When the traffic flow at the intersection is small, priority rule control should be adopted, because the vehicle delay under the priority rule control is less than that under the signal control. When the traffic flow at the intersection is large, signal control should be adopted, because at this time, the vehicle delay under signal control is less than the vehicle delay under the stop way control.
(2) road network traffic control
(3) section traffic control
(4) expressway traffic control
Traffic control type

By category
(1) control based on traffic restrictions
(2) traffic signal control
(3) control based on information transmission

According to the scope of control division
(1) single point control
(2) main line control
(3) regional control

Divide by control mode
(1) single point timing control
(2) single point induction control
The principle of induction control is to adjust the length and time sequence of green light according to the traffic flow data measured by the vehicle detector to adapt to the random change of traffic flow.
(3) there is no cable coordinated control in the trunk line
(4) the trunk line is controlled by cables
(5) regional timing coordination and control
(6) regional adaptive coordination control
Adaptive control is based on the road traffic information detected, and based on the future traffic demand predicted by the prediction model, the corresponding optimization scheme is selected from the system signal timing scheme database, or the corresponding optimization control scheme is generated by real-time calculation to achieve automatic traffic control.

According to signal timing generation technology division
(1) manual optimization technology
(2) offline optimization technology
(3) on-line optimization technology