No, it's not and you're being incredibly obtuse.
There are any number of ways in which you could screw with map data to trick a car into going somewhere it isn't supposed to go. Those sensors, they only have a range as far as they can detect which is typically not as far as you seem to think. Pretty much as soon as you can't see in front of you the sensor isn't going to do much better. If you program the map to not recognize the highway that's outside of that radius, the sensors aren't going to save you. If you tell the sensors that the road is one way or that it's a one way street a couple blocks down, the sensor isn't going to pick that up.
The point is that there's plenty of precedence for these kind of sneaky attacks against computer systems, I see absolutely no reason to believe that the computer systems in an autonomous car are going to be special in that regards.