Combinatorial model involving mixed deterministic freight volume distribution and user's equilibrium

Freight volume distribution and traffic assignment are two key problems in transportation planning. However, the existing models have some defects. Considering characteristics of Chinese urban mixed traffic, the author develops a combinatorial model involving the mixed deterministic traffic volume distribution and user's equilibrium (UE) assignment on the basis of symmetrical link travel time function by aid of share model. Its uniqueness and equivalence to Wardropian principle of UE are also proved by optimization theory. Finally, the algorithm of model is given by using the direction hunting method.