Plans developed in the 1970s to continue the Mühlkreis Autobahn to Neumarkt and Rainbach were abandoned in 1983.

Nevertheless, after the Revolutions of 1989 and the Fall of the Iron Curtain, the transport route from Linz to Prague gained a new significance.

When the Czech government announced the construction of the D3 motorway to the border with Austria in 1993, plans for an expressway through the Mühlviertel region were resumed.

Construction started in 2009, and a first 2.5 km (1.6 mi) long section near Unterweitersdorf was opened in 2012.

Construction work on some of the remaining section from Freistadt to the Czech border has started in the 2020's.