Final design of the main highway from Derveni to Dorkada (15.8 kms) and the regional road from Kilkis to Langada (11.0 kms), including toposurvey works, highway design, drainage, structural design, geotechnical investigation, traffic management and preparation of tender documents. The main highway is the southern section of the vertical to Egnatia Freeway axis connecting Egnatia freeway (Derveni junction [east of Thessaloniki]) with the Greek-Bulgarian borders at the Promahonas Customs control area, bypassing the city of Serres (Thessaloniki -Serres - Promahonas).