The Metropolitan Region of Rotterdam The Hague is working to improve public transport. The existing route between Schiedam and Hoek van Holland underwent a metamorphosis: from a normal railway line to a modern metro.

On behalf of Haitsma Beton, Lincon provided the engineering of a viaduct with a trough shape. The trough shape is constructed from prefab concrete box girders, between which an approximately 3.60 meter wide and 600 mm thick floor is poured. After pouring, the underside of the floor and beam are the same. The advantage of this solution is that the structure height can be restricted, and that there remains free a maximum amount of space under the overpass.