The wing you see in the picture above was developed at MIT by AeroMotions. You may be asking why the wing is split in half. The answer is that each half actively moves due to servos controlled by software which determines the amount of downforce needed depending on how hard the car is turning.
This is obviously very advanced stuff that’s still in the development phase but they managed to take it out for its first test on an autocross course. Check out the video below and be amazed at how quickly the wing adjusts to each turn. Also notice how when the driver is going flat out on a straight the wing completely levels out to reduce drag. Simply amazing!