Sauber ran turning vanes on the upper part of the front wishbone, a concept later applied by
Mercedes to its own front suspension. What you want to do here is pull air into the low-pressure area behind the front tyre because it’s a very turbulent area, and the more you fill up that hole created by the tyre, the less work the parts in front of the sidepod have to do. The brake ducts also work towards this. Also, when the tyre is rotating and the airflow is navigating it, you create a bit of lift on the tyre’s upper surface, so this also helps to eliminate some of that negative. For this to be legal, you have to comply with the regulation requiring an aspect ratio of no greater than 3.5:1 in suspension components.