Smaalensbanen is part of the old railway route from Oslo to Halden, through Vestby municipality. The route extends from Kjenn and Kjennstjernet in the north, through Hølen town over the Hølenviadukten, to Sonsveien station in the south. Like the old railway route, the Smaalensbanen is flat, and therefore accessible to everyone. The area is suitable for walking and cycling, and as a transport artery through Vestby municipality. The entire route is approx. 5 km long.