A6 Attiki Odos

From the A8 junction at Elefsina (km 0) to the A1 crossing at the Metamorfosi interchange (exit 8, about km 23.1). The concessionaire announced the opening of Elefsina – Metamorfosi in 2003; Wikipedia dates the opening of the western part to November 2003. Length measured on the OpenStreetMap alignment.

From the A1 crossing at the Metamorfosi interchange (exit 8, about km 23.1) to the Kymis Avenue crossing (exit 10, about km 26.35). In spring 2002 the concessionaire reported this stretch as already in service for a year; it opened separately from the rest of the western A6. Length measured on the OpenStreetMap alignment.

From the Kymis Avenue crossing (exit 10, about km 26.35) to the Kifisias Avenue crossing (exit 11, about km 28.4). No source dates this stretch on its own: the opening date is Wikipedia's for the western part, Elefsina – Kifisias Avenue, in November 2003. In May 2002 the concessionaire had planned it for the end of 2002. Length measured on the OpenStreetMap alignment.

From the Kifisias Avenue crossing (exit 11, about km 28.4) past the Pentelis Avenue (12) and Doukissis Plakentias (13) interchanges to the Gerakas road crossing near exit 14 (about km 34.1). English and Greek Wikipedia date the opening of Kifisias Avenue – Airport to early 2003; the concessionaire started tolling a newly opened section on 7 February 2003. The Pentelis Avenue entrance towards the airport opened on 2 September 2003. Length measured on the OpenStreetMap alignment.

The first section, 19 km by the concessionaire's figure: the A6 from the Gerakas road crossing near exit 14 (about km 34.1) past Marathonos Avenue (15), Leontario (16), Kantza (17) and Paiania (18) to the Airport interchange (exit 20, where the A64 crosses at about km 47.7), then the A64 towards the airport as far as the northern limit of Attiki Odos (km 50.59 of its chainage), where the airport's area begins. It opened on 19 March 2001, nine days before the airport. Entry from Athens was by Gerakas road and Marathonos Avenue; at Kantza and Paiania only the exits worked at first.

The branches of the Airport interchange (exit 20) to and from Markopoulo and the Markopoulo half-interchange, opened on 1 July 2002: the A6 from the A64 crossing (about km 47.7) to its end on Markopoulo Avenue at Koropi (about km 48.9). Before this, traffic for Markopoulo went through the signalled junction with the Vari – Koropi road. Length measured on the OpenStreetMap alignment.

The Hymettus Ring (Western Peripheral Avenue of Hymettus, signed A64 until 2024) from the Katechaki interchange (Y1, km 0.00) past Papagou (Y2), Dimokritos (Y3) and Agia Paraskevi (Y4) to Glyka Nera (Y6, km 8.05). Length from the Nea Attiki Odos chainage as given by English Wikipedia. The concessionaire opened the Hymettus Ring on 3 September 2003; the stretch east of Glyka Nera had opened in July 2002. The Hymettus tunnels were added during construction after Council of State rulings.

Glyka Nera – Rafina interchange section of the Hymettus Ring, 2.5 km, opened on 1 July 2002: from the Glyka Nera interchange on Lavriou Avenue (Y6, km 8.05) to the Leontario interchange with the A6 (Y7, km 9.83 to 10.47 on the Nea Attiki Odos chainage). The concessionaire called the A6 junction the Rafina interchange at the time.

Extension of the Hymettus Ring as a Pallini bypass, about 1.5 km, opened on 5 August 2004: from the Leontario interchange (Y7) to the Pallini interchange on Marathonos Avenue (Y8, km 11.70 on the Nea Attiki Odos chainage), giving traffic from Elefsina and the Hymettus Ring a route to Pallini, Pikermi and Rafina. The A62 east of Pallini to Agios Gerasimos (Y9) is not recorded, for lack of a sourced opening date.

The A621 (signed A642 until 2024), the western link between the Hymettus Ring and the A6: from the Agia Paraskevi junction on the A62 (Y4) through the Panagouli tunnel to the A6 at the Doukissis Plakentias (13) and Pentelis Avenue (12) interchanges. Opened in April 2004; 2.5 km according to Greek Wikipedia, 2 km in the English article.