On 2013-12-05 05:54, Marc Gemis wrote :
Another question related to this boundary. Originally I did not touch the boundary between Mechelen en Bonheiden. I just reused it for the Muizen-boundary. I now noticed that the Bonheidensteenweg (http://www.openstreetmap.org/way/146650425) was partially in Muizen-Mechelen and Bonheiden. So I moved the boundary at that point, i.e. moved 1 point by merging it with the streetname change point.

But now I wonder whether the boundary should not be over the stream  Boeimeerbeek. That makes more sense to me.
Yes, from an imprecise map I have, the boundary follows Boeimeerbeek and it's most of the time the case when it looks like following something, but you may have some sudden excursions.
What to do then, is draw the boundary very near to the road/river, but not to use them as the boundary. If you do so, I can assure you that, sooner or later, someone will want to change the road/river and destroy your boundary.
Near enough so that the map show them at the same place, but far enough to be able to select one at OSM.org zoom level.
Destruction has begun already ;-)  Some joker attached the boundary to one end of the bridge. I'm used to that!
In this case the street name change should occur in the middle of the bridge.

I just checked AGIV, there is no (street) name on the bridge, but the street names are different on both sides of the stream. Also, the name of the stream is Vrouwvliet according to AGIV.
Bridges are a long, strange, OSM story.
Bridges are pieces of concrete put under the road when there is no ground.
Hence, OSM should draw an additional way segment under the road at layer -1, that's all.
The road (tarmac foil) continues uninterrupted, without any routing or naming concern.
But instead, OSM puts the bridge sort of ON TOP of the road AND splits the road.
Then people wonder what is the name of the bridge and routing programs wonder why the road changes.

OSM are very complicated people. A bridge normally has no name, the street name continues as if there were no bridge.  In your case, in the normal world, the street, and not the bridge, changes name simply because it crosses a boundary.
But there are, of course, big bridges in big cities that stand on their own and don't "inherit" a street name, whose road is called "Bridge XXX" as well as bridges in smaller towns on which and beside which the street is called "rue du Pont".

Cheers,

André.

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