The new telematic system HeLMi provides several public transport telematic functions as real time passenger information, bus and tram priority at traffic signals and the schedule monitoring. Although similar systems are used in several European cities, HeLMi telematic system is one of the most sophisticated because it is based almost solely on the wireless communication with radio modems. The public transport telematic has been accepted as new instrument to increase the attraction of the usage of buses even in smaller cities as V ster s and J nk ping in Sweden. In the Nordic countries the largest public transport telematic system including all of the bus and tram lines of the city is used in Gothenburg . The corner stone of the telematic system is the location of the bus.
Bus door opening at the bus stop locates the bus exactly on the right position along the route.
The bus location along the route is based on the odometer counting the accurate distance of the bus from the preceding bus stop Each bus is polled by the central equipment every tenth second. So the central computer has continuously the data of the exact position of each bus along the route. Schedule monitoring is based on the comparison of the real location of the bus to the location calculated from the schedule. The difference indicated as seconds at the driver display is updated continuously. The same indication is sent also to the fleet management room at ten second intervals.