Traffic signal lamp is important in urban traffic management a, although it may seem unremarkable, but the importance of undeniable, reasonable setting traffic signal lights, not only to increase traffic flow capacity, reduce traffic safety hidden trouble, reducing the travel time, can also be effective in reducing the consumption of energy and transportation, reduce air pollution in the city. Below small make up will take you to understand the traffic signal light is how to set?

Traffic signal lamp is based on the length of the traffic through the intersection to determine the traffic, different intersections are generally different. The calculation process is more complex. First of all, there must be some data is expected to traffic flow or traffic investigation of the existing traffic flow and import road set form, etc.. The so-called traffic flow is each hour each entrance to all directions to the number of vehicles imported setting is an imported have how many straight lane, right turn lane, straight right lanes and left turn lanes. Two concepts are introduced in the calculation.

1 saturation flow rate

Saturation flow rate: under certain conditions, a stream or several traffic flow per unit time through the intersection with saturated flow value (A / h).

Is the basic saturation flow rate multiplied by a correction coefficient of saturation flow rate calculated.

2 Lane Group

The distribution of traffic flow in the entrance lane between alternative will gradually become a balanced state, so that the traffic load level of each alternative is very close to the entrance lane. So, these alternative imports will constitute a Lane Lane combination form, traditionally called Lane group.

Generally speaking, all of the straight lane and go straight, turn right, go straight turn left carpool lane constitute a lane group; and left lanes, right turn lane separate lane formation group.

Generally different intersection signal period and green time is different. But there are special circumstances, such as coordinated control (Lv Bo), the two intersection distance etc..

Intersection traffic signal control according to different control modes can be divided into timing control, inductive control and adaptive control.

General in the city (such as Nanjing) the traffic signal length is not the same in different time period and green time, because the traffic flow has different characteristics in different time.

Traffic signal control specification in Chinese also no nationwide (refers to the timing design), there are some places related specifications. Most parts of the country with fixed 3 seconds, yellow light, 1s Quanhong (if needed), and in these two time abroad also need to according to the speed limit and geometrical condition to configure.

At the same time, Shanghai the scats (Sydney adaptive traffic control system Sydney Coordinated Adaptive Traffic System) control system, Beijing the scoot (split cycle offset optimizing technique) control system, business system internal algorithm package, with the adjustment according to the matching of the detector.

The traffic signal lamp manufacturers Xiaobian consolidation