To the northern side, the main section (number 6) connecting Elefsina shipyards-industrial zone with the Athens International Airport in Spata and counts about 50 km.
To the south side (coast), Poseidonos Avenue (Or "Paraliaki (Παραλιακή): Greek for "Coastal (Road)") runs from Piraeus (Faliro Interchange) to Voula, aligned with the coast, until it meets Varis-Koropiou and then it continues to the countryside Sounio Avenue, towards Sounio and Lavrio.
Usually the most speedy traffic is noticed on the coastal Poseidonos Avenue, thus making it need increased attention.
Eventual plans are to link it to sections of the R121 road which provides a similar service in the north west of the city, with land being reserved for this.
In addition, Dublin City Council has signed two "orbital routes" consisting of existing roads, but following these requires turning at many junctions.
This proliferation of orbital motorways is partially due to the traditional high radiality of the Spanish highway network, which routed most cross-country traffic through Madrid.