You do have to be careful with those maps from Garmin, Tom Tom, etc. when you are traveling in the rural west.
I know of a rancher in Wyoming who has to deal with lost travelers all the time. They are at the end of a 45 mile long, gravel, DEAD_END county road. But the maps show that the road goes all the way from State Highway to state Highway. He has had gates left open between pastures, gas siphoned out of his trucks, gas stolen from his pump by the garage, people stranded because they ran out of gas, and other things happen. People have cussed him out because "their GArmin says its a road and he has no right to make them turn around and go back the way they came".