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The highway E-80 is of strategic importance for the development of the main regional transport networks for South East Europe and it will provide optimal road connection with the Republic of Bulgaria and the Republic of Albania and wider with the other countries of the European Union. For the needs of preliminary design of the highway, specific geological investigations were performed (terrain and laboratory). Investigations are mainly focused on those parts of the terrain where the construction of tunnels, larger...

The paper starts with the presentation of some general elements for characterizing, from morphological, geological, climatic, rainfalls and hydrographical point of view, a national road routing, highlighting the specific particularities which are concerning the study of the instability phenomena. Further on, are presented the types of instability phenomena present on the national road routing, including the general causes that produced them. The paper ends with the analysis of two case studies, considered as being...