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Just wanted to expand on that.  It should show two or three alternate routes (ranked by fastest to slowest).  Although, I don't think it needs to show directions/maps (could be an external link).  Instead just show a summary of the route (for example I-405S to 22, etc.).  I think this app/service should focus on time (possibly times) and stay away from navigation/maps.  Just let me know which route was used.