Torque Shop: How the drag reduction system boosts speed

On F1 cars, drag reduction is achieved when a flap in the rear wing opens to allow a smoother airflow and, hence, reduce air resistance. PHOTO: AFP
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What is the DRS, or drag reduction system, used in Formula One (F1) that helps give the cars higher speed? Are there road cars that incorporate this type of system? Also, would reducing drag not compromise stability?

On F1 cars, drag reduction is achieved when a flap in the rear wing opens to allow a smoother airflow and, hence, reduce air resistance.

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