Overtaking was difficult in F1. There is a huge reliance on aerodynamic downforce in F1.
Due to the aerodynamics of the cars there is a huge amount of turbulent air behind them. This is called dirty air. All this dirty air reduces the effectiveness of the aerodynamics of a car following another. The closer a car got to the one in front the harder it was to keep close as the grip was reduced by the dirty air mucking up the aerodynamics. This prevented cars getting close enough to overtake.
To make races more exciting there needed to be more overtaking.
It was decided the way to increase overtaking was to allow cars following another to reduce the amount of drag from their wings by opening them up on straight sections where downforce isn’t required so much. This would let them go faster.
There are several DRS detection and activation zones on each track. The exact amount varies between tracks. If a car is less then a second behind at a detection zone at the next activation zone they can open the rear wing to go faster and potentially overtake more easily.
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