According to the characteristics of city transportation, on the PC-PLC network platform, adopting an original uniform line control technology to multi-crossroad, we implement an intelligent and coordinative control to the signals of the city traffic trunk line.

Realize the connection among trunk line, branch line and user allocation system using dark line transmission which is modern and scientific.

A method based on Q-learning for area traffic control is presented to optimize the cycle of a whole area,divide traffic network into several trunk roads and put them in order according to their importance,and optimize the offset and split for every two neighboring intersections following the above order.

An urban traffic algorithm of the trunk road based on fuzzy control is proposed, which has two fuzzy controllers, the one that extends the time of green light and the other that determines which phase will be the next green phase time.

An Algorithm of Routing Control for Postal Transporting Based on the National Main Line;

The trunk line transmission network is that one distributes the network activly that the main line is transmitted.

Discussion about the design of the mobile trunk network in a province;