Systra Türkiye and TYLin have been selected to design Türkiye’s Dörtyol–Hassa motorway and rail tunnel.
The two companies have been commissioned by the Doğuş–Eze joint venture.
The project in southern Türkiye comprises a triple tunnel configuration with 20km of two dual-lane motorway tunnels and a single-line railway tunnel. The road tunnel will be in the longest in Türkiye.
The alignments will pass through challenging geology, including the active Hassa–Kırıkhan segment of the East Anatolian Fault Zone, a major continental fault. Earthquakes of magnitude 7.3 have been recorded nearby.
The tunnels will be constructed by TBM and NATM, with a maximum overburden of 1,600m.
“The Dörtyol–Hassa project is a landmark in connectivity, creating a strategic multimodal corridor for the region. Its ambition is matched by its complexity, with extreme geology and unprecedented tunnel depths demanding innovative engineering and close collaboration. It is both a major opportunity and a formidable technical challenge,” said Systra Türkiye business development director Gokay Caglar Memisoglu
