Abstract
Traffic congestion on on-ramp metered areas will increase the delay and reduce the capacity of urban elevated road dramatically. The method of alternate driving has the function of increasing the capacity of the on-ramp metered areas under the crowded conditions effectively. Focusing on the variation of metered proportion of the main-road and on-ramp road, a cellular automaton based model was proposed with respect to the optimal capacity, which is judged by the interflow numbers. The proposed capacity model is expected to be an improvement to the traditional model with the theory of cellular automation. The evaluation work was carried out by the VISSIM software, and the simulations show good corresponding results according to the optimal capacity model.
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