I don't see why there should be only one object with that name. There are now four, which is perfectly fine if you ask me. The bridge structure itself, the road on the bridge and two small segments leading onto the bridge. They all belong to the bridge and its name. If you insist having one name, a relation could be created, but that seems overkill to me.
Besides (and I know it's not a valid argument, but) now the router will tell you to turn onto the Catharinabrug, instead of any other name that you would assign to the little stretches of road.