Abstract. This paper introduces a continuum-discrete procedure for the simulation of vehicular traffic flow and some initial results. The approach combines a continuum stream of fast vehicles with discrete trajectories for slower ones. This allows us to estimate the effects of road geometry on traffic flow, recognizing that each vehicular class is affected differently and that the classes may interact. An application of the procedure to predict the capacity of uphill grades leads to a simple formula that provides an efficient tool for the analysis and management of these bottlenecks. Unfortunately, predictions with the procedure disagree significantly with the recommendations in the latest version of the Highway Capacity Manual, which were obtained with microsimulation. This deserves further study.
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