This fourth issue of the year 2010 wants to make the point, with the illustration of projects and case studies on the processes of integration between urban design and then construction of transport infrastructure. In the vast panorama of interventions designed or implemented in recent years in Italy and abroad, we preferred the two main categories that allow an immediate synthesis of approaches, of intervention systems, of design solutions and of unresolved issues that this methodology puts in place: the Large and Small scale projects.