Most ITS applications to transit systems are oriented to the efficientudmanagement of Public Transportation (PT) operator’s resources, that is crewudand fleet of vehicles. However, the potential of ITS application to transitudsystem goes further than the efficient management of the fleet of vehicles. Inudfact, information on the real-time actual network state, if communicated toudtravelers, may be an effective tool for improving quality and effectiveness ofudservices and, hence, for diverting people to PT modes. In this paper, we focusudon Advanced Public Transportation Information System (APTIS) deployingudshared en-route descriptive information. The case study of the city of Naplesud(Italy) is analyzed. Here PT travelers have reacted positively to being providedudinformation on waiting time at stops and have expressed great interest inudreceiving additional information such as passenger occupancy of futureudvehicles. The latter information can be efficiently obtained by means of audmodeling framework simulating travelers path choice and the way in whichudthey propagate over the network, as well as Origin-Destination (OD) traveluddemand pattern. Such a modeling framework is described in this paper. This isudbased on the schedule based approach and simulates within-day dynamics inudtransit networks, on both the demand and supply side. Preliminary applicationsudto a small-scale example network are also presented in the paper.
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