Ok, try and follow.
What you see as a curve is actually 2 turns. The car is setup for the entry into the curve (turn 1) and then is setup for the exit (turn 2). Both of the actions typically are the opposite of each other (slow down, turn wheel into turn, then accellerate, turn wheel out of turn). Both actions require completely opposite inputs. Thusly, what looks like a turn is actually 2 seperate series of action. Comprende?