In the summer of 2017 SECO, in collaboration with PricewaterhouseCoopers and VWQ, finished the audit assignment on A1-A6. The highways between Schiphol-Amsterdam-Almere have been doubled in capacity. New highways, bridges and digital traffic signs were built. During two years our team performed audits for Rijkswaterstaat on the level of general management, planning management, technical management and stakeholder management of the contractor SAAOne. The audits were integrated with inspections on design and product level and with daily observations in the system-based contract control.