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Open Access Publications from the University of California

System Optimum Diversion of Congested Freeway Traffic

  • Author(s): Laval, Jorge A.;
  • Munoz, Juan Carlos
  • et al.

We study the system optimum dynamic traffic assignment (SODTA) in a network consisting of a freeway and neighboring city streets. There is only one bottleneck in the freeway and every destination is somewhere downstream of the bottleneck. Vehicles can be diverted through off-ramps leading to alternative local street routes. We formulate the problem and determine a graphical solution procedure based on Newell's cumulative plots, which yields the optimal diverted flow over time. On-ramps can be conveniently incorporated in this procedure yielding SO metering rates. The following variants are considered: capacitated and uncapacitated off-ramps, and deterministic and stochastic demand.

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