[3] The concession company is Kentriki Odos SA, which is a joint venture of ACS Group, Ferrovial and GEK Terna.

The middle section between Xyniada and Trikala was inaugurated and opened to traffic on December 22, 2017.

At the end of 2013 the concession agreement was amended and it was decided to proceed to the immediate construction of the central middle section, Trikala - Xyniada, with a length of 80 km and costing 547,000,000 euros, while construction of the northern (Grevena-Trikala) and southern (Xyniada-Lamia) section was postponed.

[7] The middle section between Xyniada and Trikala was inaugurated and opened to traffic on December 22, 2017.

In October 2018, the European Commission approved Greek public funding of €306 million for the construction of the 32.5 km long southern section of Xyniada - Lamia, linking motorways A3 and A1.