[openstreetmap/openstreetmap-website] a complete logical highway by name (#866)

[mcm-jyl]

The day before I discovered http://dev.overpass-api.de/tmp/psv/complete/, I was "hacking" on Overpass-Turbo, but just using bbox (sufficient for my needs).
For having no heuristic, accept only connected ways. Yes it won't fill gaps but if Nominatim delivers the few trunks (sorted by decreasing length) it delivers something usable.
For national roads crossing a town, this portion may have only the street name, not the national reference. If you try to fill the gap, 200 m will be to little.
On the other hand, adding a gap may coalesce two different roads in different communes.
[Here](http://dev.overpass-api.de/tmp/psv/complete/#16/48.0970/-1.6236) quite stupidly a single name is used across 3 communes. This works because it's the same street (a former road?), but very common names could be "reused" by two different communes close by.
Associated streets should be promoted, at editor level to create the relations and Nominatim should show associated streets first.

BTW, for the previous example, in fact all the service roads south from [here](http://www.openstreetmap.org/#map=18/48.09909/-1.61840) are part of Rue du Bignon. Yes about 10 buildings on 40, rue du Bignon going over 2 communes...

Until recently the [Route du Chêne Morand](http://www.openstreetmap.org/#map=17/48.09991/-1.61629) had the same name on both sides of the highway (now Rue on one side, Route on the other side). On a user point of view it's important to know that you can't go from one part to the other.

Even more crazy - here only a proper representation with associated_street or strict connection can help: The [Rue des Loges in Chantepie](http://www.openstreetmap.org/search?query=Rue%20des%20Loges%2C%20Chantepie#map=18/48.08864/-1.62449= has been split.
A truck went to Chantepie saw a "normal" Rue des Loges. But the street narrowed and went to a cul-de-sac. The guy wanted to deliver on the other side of the road. Your proposal doesn't deal with such cases as seen [here](http://dev.overpass-api.de/tmp/psv/complete/#18/48.08864/-1.62449).

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