Traffic signal setting is an important element in traffic control and in the management of urban road networks both in ordinary conditions (ex. recurrent traffic congestion) and/or in emergency conditions (ex. non-recurrent traffic congestion caused by unexpected events). The paper presents models and procedures for signal setting optimisation of signalised junctions in a congested road network. Two interacting procedures are developed to solve the system of models: • an optimisation procedure, based on a genetic algorithm, to obtain an optimal configuration of signal setting parameters and • a simulation procedure, incorporating a path choice model with explicit path enumeration and a flow propagation model, to capture effects of signal setting configuration on user path choice behaviour. The main research contributions of this work are related to: (i) the modelling of path choice behaviour in a dynamic context with vehicular flow propagation of on link and spill-back; (ii) the optimisation procedure of signal setting parameters. The system of models and procedures has been applied and validated on a real experimental test site, where the transport system is in dynamic conditions due to time-varying road network and travel demand
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