Nevertheless, two concepts were adhered to right from the outset: A. LOCATION
The Ronda de Dalt, the ring road which hems in Barcelona with respect to the Sierra de Collserola, was intended not only as an access and traffic flow infrastructure but above all as a border between the city and the mountains, between the built-up area and the natural terrain. This observation is not entirely valid in that the city has colonized (as in our case) part of that natural terrain, but even so it can be argued that the Ronda de Dalt establishes a certain limit to the city, from which point, towards the west, there is a larger expanse of natural land than built-up areas. As far as the terrain itself is concerned, this predominance translates physically into steep slopes which clearly affect anything constructed on them.