I've wondered about this. I sometimes use it for biking if I'm going to an unfamiliar part of the city, and its biking directions sometimes end up a bit weird,

I've wondered about this. I sometimes use it for biking if I'm going to an unfamiliar part of the city, and its biking directions sometimes end up a bit weird, like taking a path that, while slightly shorter, is a bit more uncomfortable (crossing somewhere with busy traffic for example.) I've also noticed that it doesn't know about many easy to cross places that everyone uses and will suggest a longer route to an "official" U-turnable spot. So, for the sections of the route I know I often ignore its directions and go my preferred way and just let it catch up. Assuming that many other people around here are making the same choices as me (perhaps a big assumption in some cases, definitely not all), it still has kept recommending the less-preferred routes.