Abstract
Main infrastructure projects have several transnational impacts. Therefore a growing effort toward the harmonisation of procedures, financial arrangements, laws and technical standards is required. The work focuses on current expropriation procedures in France, investigating valuation aspects of both rural and urban areas. French laws support for a fast conclusion of the expropriation process thank to the centralisation of administrative and appraisal power in the person of the expropriation judge. Assessment rules tend indeed to equate the expropriation allowance to the real damage caused to private owners, by means of a wide range of additional benefits, although the comparison with recent agreements between public subjects and private owners is priviledged as well as fiscal property assessments.