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PIARC (World Road Association), founded in 1909 and comprising 125 member governments from all over the world, is the global forum for exchange of knowledge and experience on roads, road transport policies and practices. With consultative status to the Economic and Social Council of the United Nations, the Association is contributing to a stable and sustainable global development of the road and transport sector.

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Term of the Road Dictionary

immersed tunnel

Language : PIARC Road Dictionary / English
Theme : Structures Tunnels
Definition : Tunnel constructed using prefabricated elements constructed elsewhere (e.g. in a dry dock), transported by floating, and then immersed and linked together in an excavation prepared beforehand within the riverbed or seabed to be crossed.

Unterwassertunnel

Language : PIARC Road Dictionary / German
Theme : Kunstbauten (syn. Ingenieurbauwerke DE; syn.Ingenierubau AT) Tunnel
Definition : Aus (z.B. in Trockendocks) vorgefertigten Bauteilen konstruierter Tunnel. Die Bauteile werden am Wasser transportiert, versenkt und in einer Ausschachtung zusammengesetzt, die zuvor im zu überquerenden Flussbett oder am Meeresboden ausgehoben wurde.