This will be a southern extension of the A5 (Ionia Odos), which will connect the Albanian border near Ioannina with the A7 (Moreas) north of Kalamata.

[1] The EO9 is officially defined as a coastal route through the Achaea, Elis and Messenia regional units of the Peloponnese, running between Patras to the north and Methoni to the south, via Kato Achaia, Pyrgos, Kyparissia and Pylos.

[2] The EO9 forms part of the European route E55 from Mintilogli – where the A5 motorway currently ends – to Kalo Nero.

[3] Ministerial Decision G25871 of 9 July 1963 created the EO9 from the old EO51, which existed by royal decree from 1955 to 1963, and also followed the same route as the current EO9.

[4][2] In 1998, the Hellenic Statistical Authority created the EO9a as a branch of the EO9, from Kalo Nero to Tsakona [el], taking over some of the Messenia regional unit's Provincial Roads.