There are plans to upgrade the section between Koropi and Lavrio to motorway standards, by constructing junctions to replace the traffic lights and generally upgrading the road.
[1] According to the Government Gazette in 1963, the EO89 runs from Stavros (near Gerakas) to Sounio, via Lavrio.
[2] The present alignment of the EO89 bypasses Koropi, Markopoulo, Keratea, although the original route ran through these settlements: in addition, the original alignment ran from Keratea to Lavrio via the hamlet of Plaka, instead of Dipseliza.
[3] The road continues to run through Glyka Nera and Paiania, as the A6 bypasses them.
The route currently has connections with: Geographic data related to Greek National Road 89 at OpenStreetMap