Abstract
This research analyses theoretical aspects on DSO (the Dynamic System Optimal assignment) and the ramp control using a simple network with parallel freeway and arterial. First, the dynamic marginal cost, which plays an important role in the dynamic analysis, is defined and several queuing patterns in DSO are described. Second, based on the DSO discussion, the ramp control strategy is analyzed. It has not been known whether the ramp control can indeed reduce the total travel time not only on the freeway but on the arterial, since the control basically decreases capacity of a link on a network. However, the analysis reveals required conditions and the optimal strategy so that the ramp control can effectively reduce the total travel cost.
