The major infrastructure projects, under construction in Athens, present a great potential for the improvement not only of the transportation system but also of the quality of life of the citizens in general. On the contrary of existing views, the exploitation of this potential is possible only if it is co-ordinated with a number of supplementary infrastructure projects and traffic management arrangements. Only an harmonious integration of the major projects in the existing transportation system (road infrastructure, subway, public transport, traffic management, etc.) of the Greek capital, through a long-term and effective planning process, will lead to the full exploitation of their potential. Special attention should be paid to the elimination of bottle-necks between the various (existing and future) infrastructure projects and transportation systems before the completion of the new projects.