It is named after the Hymettus mountain range, which it partly encircles.

The motorway serves parts of eastern Athens, and planning is underway to extend it to the southern suburbs with a tunnel following Mount Hymettus to Elliniko, and it would ebd at Vouliagmenis Avenue.

Another extension from the north-east end will extend further eastwards to the port of Rafina.

As of July 2024, the renumbering is being implemented as a result of road sign replacement.

Source: Attiki Odos,[3] Motorway Exitlists[4]