I would have guessed the bridge was built for future development, which then wasn't done. In Vienna there is a bridge that's a bit similar that for a long time

I would have guessed the bridge was built for future development, which then wasn't done. In Vienna there is a bridge that's a bit similar that for a long time was just leading to an empty field. It goes across Grenzackerstraße, which could be rathly translated to field border street. It took some time for housed to be built on the other side. There would have been the possibility that there would be just industry on both sides and then it would have been mostly useless.