Knowing how to position the flight controls during taxiing prepares you for crosswind takeoffs. When you are ready to take off, you already have a basic understanding of how the controls should be positioned. You have experienced the prevailing wind taxiing to the runway and you kept your airplane on or very near the taxiway centerline. During takeoff your job is to keep your airplane on the dashed white line and over the runway during climbout.
Source: aopaTraining and Safety Tip: Crosswind takeoffs