Coming from Munich:
Follow Autobahn A9 to Dreieck Holledau, then follow A93 to Regensburg. At the Autobahn-junction Regensburg follow A3 direction Passau to Exit 100a "Regensburg-Klinikum/-Universität".
Coming from Frankfurt/Würzburg:
Follow Autobahn A9 to the Autobahn-junction Nürnberg, then follow A3 to Regensburg, Exit 100a "Regensburg-Klinikum/-Universität"
Coming from Leipzig:
Follow Autobahn A9 to the Autobahn-junction Nürnberg, then follow A3 to Regensburg, Exit 100a "Regensburg-Klinikum/-Universität"
Coming from Passau:
Follow Autobahn A3 to the Exit 100a "Regensburg-Klinikum/-Universität"
From the Exit follow the signs "Universität/Klinikum".
There will be parking opportunities in the subterranean garage of the university. See this sketch of the Autobahn-junctions around Regensburg. Maybe this route finder is useful to you.
