If anyone is interested in calculating statewise road length statistics from OpenStreetMap data, I just documented the process here: http://www.openstreetmap.org/user/PlaneMad/diary/37790
This can be used to compare with official figures and check how accurate they are and also detect what areas needs more mapping. The code can be repurposed for calculating the length of any other linear map feature like railways, waterways or power lines as well by changing the tags used to filter the data. Do share any interesting results you find. -- Arun Ganesh (planemad) <http://en.wikipedia.org/wiki/User:Planemad> <http://j.mp/ArunGanesh>
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