Existing guidelines and regulations define the conditions to interpose an additional interchange along a motorway. These regulations mainly deal with traffic operations and safety on the transportation system involved and the motorway in question. In the present analysis, cost and land use criteria are also considered as parts of a feasibility investigation meant to grant access to a motorway. However, what is most important is the research on the “inverse” question, that is, the concern of a too long spacing which may be an impediment to sustainability. The basic concept of establishing specific criteria in view of the construction of an additional interchange reflects the need to provide reachable social assets and to permit quick access in case of emergency. The constitutive pattern presented herewith introduces conditions in favor of the potential project. Their expected beneficial effect may turn a controversial construction project to a positive asset for travellers and local society.

interchange, highway, motorway, social services, sustainability, transport