Dynamic Passenger Information System (Polish abbrev. SDIP) is an integrated information system, which delivers information on fulfilment of transport tasks using means of public communication to passengers and makes it available to management services. The main task of the SDIP system is to deliver information to passengers about estimated time of departure of vehicle operating a given run from a selected stop. Information on estimated time of departure is transferred to passengers and displayed using the system of stop information displays (LED/LCD). Messages are presented on electronic information media, including name of the stop, route number, estimated or/and scheduled time of departure, special announcements (information on traffic problems, detours, ticket prices, etc.) and advertising.