This impressive four-level stack interchange is where the A13 motorway terminates at the A20 in a T-shape; it also accesses the route through to the Maas Tunnel. In a sense, Kleinpolderplein is the gateway to the city from the west. Altogether it is an ingenious example of civil engineering skills, not just as the first application of elegantly curved flyovers, but also for being built on springy peatland at a time when 50,000 cars passed through it daily. The interchange sits above the old roundabout which accommodates cyclists and pedestrians as well as local traffic. Both interchange and motorway were provided with noise baffles in the 1990s.