System Optimum Assignment (SO)
系统最佳分配法
System Optimum Assignment computes an assignment that minimizes total travel time on the network. Under SO Assignment, no users can change routes without increasing their total travel time on the system, although it is possible that travelers could reduce their own travel times. SO Assignment can be thought of as a model in which congestion is minimized when travelers are told which routes to use. Obviously not a behaviorally realistic model, SO assignment can be useful in analyzing Intelligent Transportation System (ITS) scenarios.
系统最佳分配法通过计算路线的最小运行时间进行分配。在系统最佳分配法中，如果不加大运行时间道路使用者就不能改变出行路线，尽管旅行者实际上有可能会减少其运行时间。假如道路使用者都被告知最优路线，系统最佳分配法将会产生最小的拥堵。很明显这个模型是不现实的，系统最佳分配法在智能交通系统假设分析中是十分有用的
