Aichtalbrücke, Road bridge in Aichtal, Germany.

The Aichtalbrücke is a four-lane concrete bridge that crosses two valleys and forms part of a major transport route. It uses multiple beam structures arranged side by side to span the geography, with its substantial height visible from considerable distances.

Built between 1979 and 1983 as part of the four-lane Bundesstraße 27 between Stuttgart and Tübingen, the bridge was designed by Leonhardt, Andrä und Partner with Polensky & Zöllner and built by a consortium of R. Besemer, G. Epple and Polensky & Zöllner. It was erected by incremental launching and was then the world's longest launched bridge.

The bridge carries the four-lane B 27 between Neuenhaus and Aich, both districts of Aichtal, and its name comes from the Aich valley it crosses. Below the deck, the older two-lane B 312 bridge over the Aich lies about 1.9 km to the east-northeast, so drivers pass two generations of valley crossings in quick succession.

The bridge runs in a wide arc with a 1,500 m radius, crossing the Bombach 48 m above the valley and the Aich at 50 m. Its north end stands on the Pfaffenhau (362 m), its middle on the Geißhau (360.5 m) and its south end on the Steinenberg (383.1 m). About 1.9 km east-northeast, the older two-lane B 312 bridge also crosses the Aich.

The bridge was built using a special construction technique where large concrete sections were gradually shifted across the valleys. This method was world-leading at the time of completion and set standards for similar large-scale projects.