Mapkin is doing this actually. They let users crowd-source their own directions, along with much better turn-by-turn descriptions too. Eg, "turn sharp right ju

Mapkin is doing this actually. They let users crowd-source their own directions, along with much better turn-by-turn descriptions too. Eg, "turn sharp right just after the firehouse, go past the field and make a left just before the baseball field". Instead of "turn right, keep left and turn left". https://mapkin.co https://mapkin.co