In the pre-Ground Truth days, Google Maps in SF used to think you could take a right from northeastboound Market street onto the 101 onramp, which is both obviously the best route for a wide variety of routes and also not actually allowed. The combination meant that many route plans didn't work.
In looking into getting it fixed I heard that the contract for getting the map data prevented Google from making any modifications to the map data. Apple Maps might be in a similar situation -- aware of the problem but with their hands tied. Map data has a lot of legal restrictions for reasons I don't really get.
The map companies probably want to make the customers dependent on continuing to get map data from them, rather than just using their map data as a 'base data set' to building their own, competing map data...
In looking into getting it fixed I heard that the contract for getting the map data prevented Google from making any modifications to the map data. Apple Maps might be in a similar situation -- aware of the problem but with their hands tied. Map data has a lot of legal restrictions for reasons I don't really get.