Toyota is doing everything it can to find some extra rear downforce on its TF109. At the Hungaroring, a notoriously slow and high downforce circuit, the team added a BMW-style third rear wing element in the central 15cm of the wing. It is only in this area that move than 2 horizontal panels are allowed in the rear wing.
And as that didn't prove enough, another 2-panel wing was added above the rear light to push air up. Although less than in previous years, this item will also help the diffuser's efficiency by creating a low pressure area behind it.