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The paved portion of a racetrack on the extreme inside. Analogous to a highway shoulder, the apron often flattens out considerably -- a marked transition from the banking of the actual racing grooves. Daring or desperate drivers sometimes use the apron to pass, or to compensate for a tight condition in their racecars and get them to turn. However, the abrupt transition of the apron can also snap a car loose and force a spin.
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