Review and new thread of highway network planning

This paper studied planning logic and traffic volume forecast of highway network planning theories. Two outstanding problems in planning practice were pointed, the first is the defect in causality and value logic, the second is that traffic volume forecast is short of credibility. In order to solve the above problems, a new method was proposed by using ecological classification and coexistence intellection in ecological system, which was to decide highway network placement by using slow variables, to improve managing methods by using quick variables, as well as to realize the key leading of planning objectives and the integration of highway network functions by using generalized objective planning. The results indicate that the method is feasible.