The longest tunnel on the motorway is the 10-kilometre-long (6.2 mi) Plabutschtunnel under Graz and its outskirts.

While in 2016 some sections still remain single carriageway, including some tunnels, work is progressing to make the Phyrn Autobahn fully dual carriageway.

The Tunnelkette Klaus (8 km) and Gleinalmtunnel (8.3 km — the last sections with a single carriageway — were planned to receive a second carriageway in late 2018 and in 2019, respectively.

The motorway south of the A2 interchange is a part of the Pan-European corridor Xa.

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