[2] The interchange lies in the region Hegau in Singen in the Landkreis Konstanz.

According to the original plans, the Kreuz Hegau would form the crossing between the A 98 Basel-Schaffhausen-Singen-Lindau (aka Voralpenautobahn) and the A 81 Stuttgart-Singen-Konstanz.

The part of the A 98 from the interchange towards Schaffhausen was, on request of the CDU in 1977 in the government of Baden-Württemberg renamed to A 81.

Construction for Autobahnkreuz Singen began in Autumn 1977.

[3] Due to its unusual building form with a main north/southwest relation, the interchange has the only left hand junction in mainland Europe, the junction from direction Stuttgart for the B33 to Konstanz.