Passenger Information Systems are one of the most important elements of contemporary public transport. They significantly increase the travelling comfort for passengers, enabling them to obtain information needed to feel comfortable while travelling. At the same time they allow the carrier to communicate with passengers fast. These systems are mainly used in vehicles, at railway stations, transport hubs, stops and on platforms. Their main elements are electronic information displays and sound information devices. The visual information is provided by electronic direction displays in the vehicle. Depending on the needs, the displays have different sizes. They consist of matrices, which vary in resolutions and production technology. They are installed in the front of the vehicle, on its sides, in the rear or inside. The voice announcement system is installed additionally, it increases the efficiency of passenger information. All the devices mentioned above are controlled by an on-board computer. Passengers on board obtain complete information about the vehicle (line, route, stops, main interchanges etc.), and those who are waiting at stops know when they are able to continue their travelling. At railway stations the visual information is provided through arrival and departure display boards placed in halls, waiting rooms, on platforms, and voice announcements make it more comprehensive. The specialist software presents content automatically, sending prior determined content to all display boards in the system. A temporary modification of information is possible (for example, due to changes in departure time) as well as changing data permanently. The system of display and voice announcement control works with the timetable software. The system can display only timetable information for passengers, without taking automatically into account changes (such as delays). In the real time mode (online) the display boards show the timetable, however, it is dynamically corrected when changes in it occur. Modifications are made automatically. With it, a passenger waiting at a stop always sees the real departure time at the stop, including all possible changes in the timetable. These systems can be easily extended with additional elements so their starting can take place in stages, depending on the needs of the ordering party.