If you search it in OSM, the boundary is not highlighted, you only see an arrow on the middle of the feature.
This is while Nominatim does offer the possibility to get the polygon outline of a feature with a boundary. Just see this query: http://nominatim.openstreetmap.org/search?q=Roeselare&polygon=1&format=xml
Wouldn't it be nice to also have this on the main OSM site? Or are there services doing this Google-like boundary highlighting.