The project consists of the upgrading of an 11.4 km section of the A9 motorway between Badhoevedorp and Holendrecht. The work consists of widening the platform from three to four lanes in each direction, with the corresponding expansion of existing structures (11), new junctions with other roads, as well as bridges and tunnels. In this respect, there is a section of 1.7 km where it is planned to lower the gradient (currently an embankment) and turn it into a trench section, with three covered subsections. The project has been executed while maintaining traffic on the existing motorway and minimising the impact on the urban environment.  

In addition, the scope of the concession includes maintenance for 2 years after completion of the construction works.

The new covered areas will serve to regenerate the more urban area, generating new spaces for green areas, roads, etc. The "Tree Bridge", a very unique architectural bridge located over the closed area of the Keizer Karelweg, is one of the most significant elements of the project.

The project includes the construction of the PALLAS reactor and the surrounding buildings.
The PALLAS reactor is important for many patients with cancer and cardiovascular diseases to be treated and diagnosed. These patients depend on the medical isotopes produced in Petten, the former high-flux reactor. The PALLAS reactor will also contribute to research into a CO2-free energy supply.