Reconstruction and Widening of A9 Gaasperdammerweg

A forward-looking project with a strong environmental focus.

Improving the accessibility of the northern Randstad region as well as quality of life in South-East Amsterdam – it is with these aims in mind that IXAS, a partnership between Ballast Nedam, Heijmans, Fluor and 3i, is carrying out a project to widen the A9 between the Holendrecht and Diemen junctions. Once finished, the road will have five lanes in each direction and a reversible lane. Three kilometres of this section will pass through the Netherlands’ longest land tunnel. On top of the tunnel will be a park twice the size of Amsterdam's Vondelpark. This will result in better traffic flows, cleaner air and less traffic noise in adjacent districts.

The Directorate-General for Public Works and Water Management concluded a DBFM contract with IXAS, which took care of the design and financing for the project and is handling the construction. The consortium will also remain responsible for the management and maintenance of the motorway and tunnel for a period of 20 years after they are opened.

Permanent infrastructure meets a temporary need

Being responsible for all these elements encourages creative solutions. For example, the reversible lane was constructed first and is already open to traffic. That means we need less space for temporary lanes and we can use this permanent infrastructure to meet a temporary need. An integrated contract also makes it easier to opt for sustainable materials, as the higher investment can be recouped in the longer term.

Being a good neighbour

Given that 82,000 people live close to the construction site in South-East Amsterdam, environmental management is extremely important. Where possible, the River Gaasp is being used as a transport route. In this way IXAS is reducing the number of trucks travelling through South-East Amsterdam, among others. The temporary roads for construction vehicles have also been asphalted to reduce dust and noise. In addition, small events are being organised to inform local residents and generate enthusiasm for the project. IXAS has held ‘A9 information sessions’ in the site hut, for example, and, together with schoolchildren, flower seeds have been sown to brighten up nearby residential districts.

Further information

The project can be followed via the online visitor centre of Rijkswaterstaat.


A9 between Holendrecht and Diemen

  • Construction
  • Concessions
  • Specialties and Supply
Project Information

Project Phase: In progress

Construction Time: 2015 - 2021

Function category: Road infrastructure

Global Goals