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Find either user equilibrium, or system/social optimum for traffic
flow problem in a congested network. The time to transit
a link in the network is an increasing function of the
traffic on the link. At a user equilibrium, each user
chooses the shortest path from his origin to his destination.
The total travel time under the user equilibrium is
typically greater than the system optimum. Under a system
optimum, total delay time is minimized;
Because of complementarity constraints, we should
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