a long bridge consisting of a series of short spans supported on piers or towers, usually to carry a road or railroad over a valley, gorge, etc.
Origin of viaductClassical Latin via (see via) + (aque)duct
A series of spans or arches used to carry a road or railroad over a wide valley or over other roads or railroads.
Origin of viaductLatin via road ; see via . (aque)duct
the Glacier Express train crossing the Landwasser viaduct in Switzerland