Toyota use regulation loophole for rear wing

In an attempt to maximise downforce, Toyota have designed a new rear wing that holds an extra slot in the middle of the wingspan. The team thereby use a loophole in the regulations that stipulate two closed elements for the rear wing. Since the rule applies only to the wing between 150mm and 480mm of the centreline, an extra slot was possible. This allows the wing in that area to be steeper without risking to stall it.
Additionally, you can also see in the picture that Toyota had a double top wing on the airbox, rather than the usual single aerofoil. While one or two years ago this was very common, today it is a rarity.