An app that will help people track their bus/tram by giving real time updates about its location. The location is tracked by monitoring the location of the commuters riding the bus/tram using the same app! It works both ways.
If you are riding a bus/tram, you turn on the app to see how far you are from your destination and by doing so, your location is tracked to give updates to people waiting for the bus/tram. The ideas involves crowdsourcing geo-tagged information from commuters.