Construction consortium SAAone, commissioned by Rijkswaterstaat (the Department of Waterways and Public Works), executes the project A1/A6 Diemen - Almere Havendreef. SAAone is a part of the Schiphol - Amsterdam - Almere (SAA) expansion route along the A1 and A6 motor ways. SAAone is a cooperative venture between VolkerWessels, Boskalis, HOCHTIEF and DIF.


The work will be carried out based on a DBFM (Design, Build, Finance and Maintain) contract. This means that the construction consortium will be responsible for the design, building, financing and maintenance process. The contract term is 30 years. The A1/A6 will be expanded over a distance of 20 kilometres. This includes two reversible direction lanes across the entire expanded section.

Road expansion

Construction consortium SAAone was selected based on the Most Economically Advantageous Offer (MEAO) method, which looks both at price as well as quality. The parties involved all have a lot of experience with comprehensive construction projects including maintenance. Thanks to the construction consortium's mutual expertise, it is the ideal candidate for the job.


Preparatory work is planned for 2013, with the actual construction work commencing in 2014 and scheduled to last until 2020.

The expansion of the road system between Schiphol Airport, Amsterdam and Almere aims to achieve:

  • Improved accessibility of this economically important region
  • Smoother flow of traffic
  • Shorter and more reliable travel times


Facts and figures

  • The number of lanes between the Diemen interchange and the Hollandse Brug will be upgraded
  • The number of lanes from the Hollandse Brug to the Hoge Ring near Almere will be
  • A part of the A1 motor way will be moved
    at Muiden
  • There will be a new junction
  • There will be a bypass of the Diemen interchange from A9 to A1 with a new bridge
    over the Amsterdam Rijnkanaal
  • An aqueduct will be built
    underneath the Vecht River at Muiden
  • The Muiderberg interchange
    will be adjusted
  • The Hollandse Brug
    will be adjusted
  • There will be a new junction
    between Almere Stad-West and Almere Haven
  • There will be a new interchange
    at the Hoge Ring junction at Almere
  • Related companies
  • Project categories
    Road construction and maintenance

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