One curiosity on this part is a 3 km long strip at Roetgen where the German federal highway leads through Belgian territory.

This strip has no connection to the Belgian road network, and the only notice of the border crossing is a small sign reading Belgien (Belgium in German).

There is one house along this strip of road, which has a Belgian post code, but is connected to the German telephone network.

Originally, the road went further to the city of Koblenz, but this strip has been downgraded due to the nearby Bundesautobahn 48.

Since 2010 the road has been running from the Relais Königsberg via the Monschauer Straße at Aachen-Lichtenbusch to the Bundesautobahn 44.