Pretty darn good, I'd say. The route follows pretty much what I take to work. Google doesn't know about a pedestrian walk that connects two streets, which I take because it safes me from a much busier street. Interesting also in Chicago it routes you through a lot of alley ways (which I learned you don't what to bike through if you don't like to get a flat). It's not perfect for the routes I checked, but pretty good nevertheless.