I mentioned Google Maps as you mentioned Bing Maps, if I want quality I would not use either. To my knowledge is BGT layer in BAG the source with the highest quality. Still it contains errors (and I communicate with municipalities about them to get them fixed where possible), but far less than any other source I know. Also many names are missing in BAG. One of the reasons why a name is missing can be that the municipality council named a road, but that council only had jurisdiction over the part of the road in their area and not of the part in the neighbouring municipality. In the local community the full road has that name, but in BAG only the part of the road within that municipality is shown with that name. Later on municipalities have been merged, but the new municipality council found it often too much work to fix the parts with legally no street name. So yes, between Walem 6A and the holiday home 1-145, legally it has no name, but practically it has. 