Means - if you have an address, road name or topography won't help you. Most roads don't have a name, anyways. Not sure about US but in EU it's pretty common that houses are bound to roads so the address encloses road name and house number on this road. In Japan it is different. City is divided in areas, which are divided into smaller areas, all the way down to the building. Even locals often don't know the layout and are unable to tell how to reach the house on next square just by looking at the address.