The Information Centre HSL-A4 is an interesting building which displays presentations designed to tell visitors about the construction of the High Speed Train and the widening of the highway A4. The highway A4 is a long highway that runs from Amsterdam to the Belgian border. The highway is still under construction, but the current completed route covers a stretch of 115 kilometres, covering The Hague to Delft, Vlaardingen to Pernis, and Bergen op Zoom to the Belgian border.