Has anybody thought of a server where you could have people uploading their current position, heading and speed to monitor the traffic and avoid traffic jams ? I'm thinking about implementing something along those lines, but I'm aware that the project will only benefit when there is a high number of people collaborating also. I'm also thinking about using the GSM cell tower info from the cellphones so that you could get a location fix without a GPS, but that's going to required the mapping of the cell towers. Anybody can help me out pointing to projects that try to address these ideas ? Thanks in advance, Diogo