Here are a few suggestions for your next trip from Sigmaringendorf

In 3 hours, you can reach Zürich, Schaan, Vaduz, Triesen, Munich, Eschen, Stuttgart, Mauren, Winterthur, Ruggell...

In 4 hours, you can reach Basel, Bern, Frankfurt am Main, Strasbourg, Luzern, Nürnberg.

In 5 hours, you can reach Köln, Salzburg, Düsseldorf, Innsbruck, Lugano, Biel/Bienne, Thun.

In 6 hours, you can reach Paris, Luxembourg, Esch-sur-Alzette.