Actually, an "unofficial" speed limit, an exception to 50 kmh.
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/96123571@N00">Nils Geylen</a> from Antwerp, Belgium
CC BY-SA 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/96123571@N00/2143968914/">70 km</a>