There are also one too many buttons when you choose a route. If I want to drive, then I type in the address, select it, press a button to activate it, then press a similar button to start the route.
Personally I like this UX. I often pullup the directions to a destination without actually starting turn-by-turn navigation: I'd like to see whether Google recommends taking highway X or Y, and then I can drive the rest of the route myself.
