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。
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.
系统最佳分配法通过计算路线的最小运行时间进行分配。
System Optimum assignment computes an assignment that minimizes total travel time on the network.
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