Research on Theory Architecture of Signal Phasing with Expert System for At-grade Intersection

This paper clearly describes qualitative and quantitaive relationship between signal phasing and timing in the process of signal design. According signal phase′s character, paper proposes theory architecture of signal phasing with expert system and designs completely feasible knowledge base. Signal phase generating and optimizing model is presented. In signal phase optimizing model, numbers of conflicting points between all kinds of traffic flows, timespace resource utility ratio and total lost time of signal phase are introduced toevaluate signal phase schemes. Paper provides complete architecture and strong theory basis for developing signal phasing with expert system.