By itself, OSM is just a geo database so it's somewhat misleading to state "what it doesn't tells you". In fact, OSM is perfectly capable of representing lane

By itself, OSM is just a geo database so it's somewhat misleading to state "what it doesn't tells you". In fact, OSM is perfectly capable of representing lane restrictions (http://wiki.openstreetmap.org/wiki/Lanes http://wiki.openstreetmap.org/wiki/Lanes) and some of the existing OSM clients (such as OsmAnd) offer 'lane assist' (arguably, it might not be as good as Google's but there's no fundamental problem in achieving feature parity). And while the GMaps feature of offering you route alternatives based on the current traffic is nice, the "price" you are paying for it is unconditionally sharing your location with google while the GMaps app is running (or even at all times, depending on you settings). I personally don't feel comfortable with that compromise.