Hybrid Mesoscopic-microscopic Traffic Simulation Framework
J Casas, TSS/University of Vic, ES; Josep Perarnau, Alex Torday, TSS, ES
The evaluation of ATMS requires a network-wide assessment, therefore this papers presents a framework where the evaluation is done using an hybrid model (mesoscopic and microscopic traffic simulation)
The evaluation of ATMS requires a network-wide assessment of their impact as opposed to an isolated analysis of key intersections. Microscopic traffic simulation models emulate the dynamics of individual vehicles in a detailed network representation, based on car-following, lane changing, etc; include route choice models to implement dynamic traffic assignment. Microscopic models are usually appropriate for operational analysis due the detail of information provided by the simulator. However, they are data intensive and have a significant computational cost. Mesoscopic models combine simplified flow dynamics with explicit treatment of interrupted flows at intersections and allow modeling of large networks with high computational efficiency. However, the loss of realism implied by a mesoscopic model makes it necessary to emulate detailed outputs (detector measurements, instantaneous emissions). The above give rise to the need to combine meso and micro approaches into new hybrid traffic simulators where very large-scale networks are modeled mesoscopically and areas of complex interactions benefit from the finer detail of microscopic simulation. Combining an event-based mesoscopic model with a more detailed time-sliced microsimulator raises consistency problems on the network representation and the transitions meso-micro-meso. This paper extends previous work, extended to the important element that impacts the consistency representation of traffic dynamic in mesoscopic and microscopic model, going into detail the treatment of the boundary conditions between mesoscopic and microscopic model and viceversa. A case study illustrates the importance of the method in order to guarantee the consistency of the hybrid model, adding to the microscopic model the interaction between the microscopic traffic simulator and microscopic pedestrian simulator.
Association for European Transport