In 1998 and the following years all cars which are more than three years old must be inspected by the Danish Car Inspection (Statens Bilinspection) every second year. Therefore the Danish Car Inspection needed to know how, when and where should the cars be called in for inspection and which capacity was necessary. To answer these questions we developed a large aggregated optimization model. The results from the model was used by the management of the Danish Car Inspection to make decisions concerning the overall structure of the future process for car inspection.