How is routing done on maps?
gojomo: Though Google shows the shortest route by default, you can drag the line to select alternate routes, and the instant updating suggests the other paths are already locally loaded. So their APIs may already provide (or leak) enough info for you.But even if they don't, you can probably buy the same data from their source or another provider. (See that little 'Tele Atlas' copyright at the bottom of Google Maps? Or 'NAVTEQ' at the bottom of Yahoo Maps?)