A frequency based transit model for dynamic traffic assignment to multimodal networks.

This study models the dynamic behaviours of heavy congested, urban, multimodal (transit and road) networks, where the service is so irregular or sofrequent that there is no point in passengers synchronizing their arrivalat the stop with the scheduled time of carriers, if any is published. Within this context, it is aimed at properly reproducing the important dynamic congestion phenomenon of the temporary over-saturation of roads and transit lines. A new model and algorithm are presented, aimed at solving the multimodal dynamic traffic assignment (DTA). Here, the multimodal DTA is regarded as a dynamic user equilibrium and is formalized as a system betweena dynamic arc performance function and a dynamic network loading map, thus avoiding the introduction of the dynamic network loading model and the needof explicit path enumeration. The main innovation in the multimodal assignment model proposed here is to represent the dynamic behaviour of transitsupply using a frequency approach, instead of a run approach, thus notrequiring a diachronic graph. By so doing, intra-modal congestion effectscan be efficiently and effectively simulated, particularly those producedby the capacity constraints of transit carriers, both in terms of waitingdelaysand passenger queues at stops. For the covering abstract see ITRD E144727. Reprinted by permission of Elsevier.