Road expansion A1/A6 Diemen – Almere Havendreef

The motorist driving in this area is confronted with an excess of exits and merging lanes, junctions, bridges and underpasses. In combination with the many lanes and the intensity of the traffic this is quite an assault on the senses. The most important design decision is therefore to choose for modest and uniform shapes, with simple and recurring elements. The more chance one’s eyes get to wander into the distance and experience the alternating landscape, the better.

There are two bridges along the route that enhance the road’s capacity in a way too that supports experiencing the landscape. The first one is the new bridge across the Amsterdam-Rijn Canal. Three separate decks curve across the water. And big as this concrete bridge might be, in its shape, color and the rhythm of its pillars it shows a family resemblance with the existing bicycle bridge. The abutments and banks are fully integrated into the green landscape that the canal transverses.

 The second bridge with an added landscaping element adds four lanes on a separate deck across the IJ-lake right alongside the existing Holland Bridge. The new bridge is less elevated, to keep the view from the existing bridge intact. The areas on either side of the bridge are being reconfigured with fly overs, wider and more diverse green zones and bicycle tunnels, to make the passage from the old land to the regained land, from the closed and fragmented to the open and wide landscape more efficient and a fuller experience for motorists, cyclists and hikers.

Along this vast and complex stretch of new infrastructure two highlights are to be found when considering design, engineering and integration into the landscape. These are the aquaduct under the river Vecht and the arched railway bridge at Muiderberg.

The river Vecht has its own landscape, quite distinct from the polders around it. The A1 motorway does not cross an abstract body of water, but a segment of fluvial landscape, with the design of the aquaduct aiming to amplify this experience. The banks of the river, overgrown with alder, willow, birch and poplar trees, are left wide making sound barriers superfluous. 

Most technical details (ducting, wiring, lighting, cameras) are built-in so that nothing about the aquaduct distracts from the special experience of dashing underneath a river with wide greens banks, together with a dike and a country road along side it. The sense of wonder about this seemingly effortless technical tour de force is complemented with the view of a segment of pristine river landscape, laying itself down in a slight curve.