A common problem I've had with standalone GPS units is that they get confused when two roads are very close to one another. Highway overpasses, on-ramps and off

A common problem I've had with standalone GPS units is that they get confused when two roads are very close to one another. Highway overpasses, on-ramps and off-ramps, routes right next to highways, etc. You wouldn't want your self driving car to think it's on a freeway and should do 65 when you're really on the dirt farm road right next to it.