The construction of the Gutachtal in the Black Forest in 1981, was “a show like no other, with acrobats in the form of the bridge builders performing a dazzling display between heaven and earth,” says the editorial team. “Two men squat down on narrow iron girders at the edge of the abyss, 94 metres above the ground. Secured only by ropes, they install the next section of the Gutachtal bridge.” All while trucks carried on driving below: “Concrete mixer on Mercedes‑Benz chassis 2224 B/6×4 or 2626 B/6×4. Reliability is paramount, and not just for the big juggernauts.” Concreting is carried out on site in the cantilever method by means of a moveable formwork system. Every week, four to five metres of bridges are “glued” to the already completed structure.