Between the and 2007 races, the Circuit de la Sarthe was upgraded, most obviously by the reprofiling of the Tertre Rouge corner. The new corner was moved inward, to create a long flowing curve instead of the single point apex it had been previously, shortening the lap distance by 21 meters to a revised 13.629 km. A new pedestrian tunnel – below the Mulsanne Straight, immediately after Tertre Rouge – was also built. The work had been planned to be carried out before the 2006 event, but it was delayed because of budgetary concerns.