Well, in London you might say 'turn left down XYZ road', so we have a system of navigating that's less changeable than things like shop names.
Not that it isn't a neat system to have, but I'm guessing it's pretty labour-intensive to get off the ground, and needs a lot more maintenance to keep it reliable.
You do say "Turn left down XYZ Road" but if you don't know or can't see which road you are on(happens quite often in the small bylanes in Central London), there is always the very reliable, do you see "name of pub" in front of you - walk towards it.
Not that it isn't a neat system to have, but I'm guessing it's pretty labour-intensive to get off the ground, and needs a lot more maintenance to keep it reliable.