The Kalloni - Eressos - Sigri road is located at the island of Lesbos, in the northeastern Aegean Sea. It has a total length of 50 km. Some road sections required safety improvements, while other sections had to be realigned in order bypass existing residential areas. The study comrpised various levels of reconnaissance study, the preliminary design, the final design and the supporting studies (environmental studies, elaboration of topo-maps, geological and geotechnical studies, drainage of surface water, structural design, expropriation studies). The road design speed is 50 km/hour and there is one lane of 3.75 m per direction, with additional lanes wherever local conditions require so. The services provided included: detailed environmental impact assessment; field surveys for full topographic and geological data; topo-map elaboration; geological study; formulation of a programme for geological investigations; geotechnical investigations; transportation final design; hydrological study; structural final design; drainage network design; and tender documents.