The City of Vancouver has developed a cycling map, with the help of the University of British Columbia, that factors in such things as maximum slope restriction, least traffic pollution, most vegetated route, shortest path, and least elevation gain. The route finder also returns such details as estimated time, the amount of greenhouse gases prevented, calories burned, and overall elevation gain. They also have enabled an Earth button to see the route in Google Earth 3D.
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The City of Albuquerque, NM, now has an interactive map as well. We are getting more bike friendly all the time!
http://www.cabq.gov/gis/bikemap.html