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The point on the track where you begin turning the steering wheel to enter a corner. Consistent turn-in points are a hallmark of precise driving and help you find a repeatable racing line.
Going Faster! defines the three reference points of any corner arc: "It begins at the turn-in point, comes closest to the inside edge of the corner at the apex, and comes closest to the outside edge of the road at the track-out point." Bentley's Ultimate Speed Secrets discusses the steering technique debate: "Through the years I've heard numerous discussions on just how a driver should turn the steering wheel. While some people claim you should pull down with the hand on the inside of the corner, others say you should push up with the outside hand" — both approaches have trade-offs. The HPDE Curriculum Guide lists turn-in as a core performance outcome, with drivers expected to use fixed visual reference points to initiate the arc consistently lap after lap.