A Passenger Information System (PIS) called TUTPIS has been developed for networking passengers with companies that provide public transport services. TUTPIS supports a passenger with personalised, real time information services in all phases of a journey. Services include timetables, travel route searching, route reservations, and electronic payment. TUTPIS is targeted to operate on the developing wireless network infrastructure of mobile, local, and personal networking technologies. A TUTPIS model concentrating on bus services has been implemented using the Specification and Description Language (SDL). The model contains functional implementations of a TUTPIS server and mobile terminals. In addition, the behaviour of external entities, such as busses, trains, and third party systems is implemented for simulations. By simulations, the operability of TUTPIS can be verified and performance estimations for system servers, wireless network throughputs, and mobile terminals derived.