关键词: 交通工程, 时空资源配置, 车道模型, 交叉口, 通行能力

Abstract: To optimize the configuration of spatial-temporal resources at intersections with mixed traffic flow of passenger cars and heavy vehicles, this paper proposes a set of mixed integer linear programming (MILP) model with aim to maximize the intersection capacity. In the model, different impacts of the locations of permitted lanes on flows of different modes and vehicle turning maneuvers are considered to increase the model applicability. The constrains on the relative setting position of permitted lanes for left-turn, through and right-turn are released. That's to say, the permitted left-turn lanes don't have to be on the left of the permitted through lanes, and the permitted through lanes don't have to be on the left of the right-turn permitted lanes. This may induce some new flow conflicts (potential conflicts) and whether these conflicts exist is affected by the lane channelization scheme. Thus, some constraints are added in the model, among which one is to identify which potential conflicts are arisen with specific lane scheme, the other is to determine these conflicts' impact on the configuration of temporal resources at intersections. The results from numerical tests show that this impact will change the configuration of spatial-temporal resources at intersections. Compared with the conventional lane-based model, the modified model can significantly improve the intersection maximum capacity while ensure safe flow propagation. The improvement on the intersection maximum capacity increases with the heavy vehicle proportions and the impact of lane location on travel efficiency. But with the increase of the difference of travel efficiencies between heavy vehicles and passenger cars, the improvement first increases and then decreases.

Key words: traffic engineering, configuration of spatial-temporal resources, lane-based model, intersection, capacity