Trains run briefly on existing tracks for a few kilometres before entering the high speed line again. At Barendrecht the two tracks cross each other and the trains begin left-hand running as in Belgium, France and the United Kingdom. From here the line runs next to the existing railway as well as the Betuweroute, continuing through the Hoekse Waard area, bypassing Dordrecht. South of Dordrecht, the line runs next to the A16 motorway with a branch spurring off to the city of Breda. South of Breda, the line again follows the motorway towards Antwerp in northern Belgium. At the Belgian border, it connects to HSL 4, which carries on to Antwerp, with an existing line from Antwerp to Brussels.