Rijkswaterstaat (RWS) procured works and services to widen the A6 motorway, aiming for the motorway to be energy neutral after construction. RWS developed instruments to calculate the CO2 emissions, then selected a tender using a combination of price and quality according to the economically most advantageous submission. This was the Procura+ Award winning tender in 2016 for Tender Procedure of the Year.