The tram system that now criss-crosses the historic city centre complements walking and biking in it. The centre has been transformed into a pedestrian priority zone that enables and invites walking and biking by making these active modes of transport comfortable, safe and enjoyable. These attributes are accomplished by applying the principle of "filtered permeability" to the existing irregular network of streets. It means that the network adaptations favour active transportation and, selectively, "filter out" the car by reducing the number of streets that run through the centre. While certain streets are discontinuous for cars, they connect to a network of pedestrian and bike paths which permeate the entire centre. In addition, these paths go through public squares and open spaces increasing the enjoyment of the trip. This logic of filtering a mode of transport is fully expressed in a comprehensive model for laying out neighbourhoods and districts – the Fused Grid. COUNT 4
QSN1 What system also complements walking and biking?  ANS1 tram QSN2 What kind of priority zone has the city centre been transformed into? ANS2 pedestrian QSN3 What do bike paths go through to add enjoyment to the trip? ANS3 public squares QSN4 What is the layout of the neighbourhoods called? ANS4 Fused Grid