A9 Badhoevedorp - Holendrecht
A9 Badhoevedorp - Holendrecht
The A9 Badhoevedorp-Holendrecht project (A9BAHO) is part of Rijkswaterstaat’s Schiphol-Amsterdam-Almere programme (SAA). The objective of the programme is to improve accessibility and traffic flow in the north of the Randstad, the conurbation in the western Netherlands that includes Amsterdam, Rotterdam and The Hague. The section between the Badhoevedorp and Holendrecht junctions is an important link in the southern ring road around Amsterdam.
Objective of the project
The project aims to increase the capacity of the A9, to improve road safety and contribute to a better quality of life in the region. This will be achieved by widening around 10 km of the motorway from 2x3 to 2x4 lanes and redesigning the connections, junctions and surrounding environment.
Important elements of the project:
- A9 widened from 2x3 to 2x4 lanes.
- around 1.5 km of the A9 sunk below ground level through Amstelveen.
- section through the centre of Amstelveen covered over.
- Badhoevedorp and Holendrecht junctions redesigned, including the on-ramps and off-ramps.
- noise reduction measures implemented and bike tunnels and ecoducts constructed for better landscape integration.
Role of Witteveen+Bos
Witteveen+Bos has been involved with the project since 2015 and is responsible for delivering technical advice. We operate as an integrated part of the technical team of the client’s (RWS) project management structure. Witteveen+Bos has a team of specialists and coordinators who advise on all technical aspects of the contracting, design and implementation of the project. One aspect of our work for the project was carrying out a quality and risk impact analysis of the Programme of Requirements for the DBFM contract (Design, Build, Finance, Maintain).
Witteveen+Bos also contributed to the substantiation of design decisions and client requirements for the required approvals (KAd/Gate). As regards verification and validation, Witteveen+Bos and Rijkswaterstaat jointly developed the process for risk-oriented assessments of the design and work of the contractor.
The project is now well under way. The work of Witteveen+Bos in this phase includes carrying out risk-oriented observations and assessments of the work of the contractor.
Timetable
Construction started in 2020. The project is expected to be completed around 2027. The works are being carried out in phases to keep the disruption to traffic and local residents to a minimum.
Collaboration
The project is being implemented by Rijkswaterstaat in collaboration with the VeenIX construction consortium (consisting of Count & Cooper, FCC Construcción and other partners) under a DBFM-contract.
Improving biodiversity
The A9BAHO project includes active measures to ensure a positive environmental impact. For example, roadside ditches are being transformed into nature-friendly embankments (NVOs). These gentle slopes provide a natural transition from water to land, which improves the water quality and creates a favourable habitat for species including grass snakes, frogs, newts, dragonflies and underwater plants.
According to Witteveen+Bos, infrastructure ditches have a huge potential for nature development, particularly as they are often not fertilised. Including NVOs in an ongoing project such as A9BAHO shows that biodiversity can also be improved along existing roads, provided that clients and consultants are committed to making a difference together. Witteveen+Bos plays a proactive role by promoting climate-neutral and nature-inclusive designs in all our projects.
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