When a human drives in a new area she must observer traffic signs, lights, markings, etc. She must become aware of all routes, access and egress with out help from some GPS system. Yeah it may be used to find a location, but beond that she must do the driving with out help of specialized directions.
The self driving car (SDC) MUST do the same thing, Yeah one can provide the SDC with a set of regular traffic signs, lights, markings, etc, but it must be alble to handle accidents, construction, new and closing of old entrances, exits, etc. So knowing where every corner and driveway exists is over kill, it must think for it self and figure out the way with out human intervention.