F1 cars want to go fast, but not just in straight lines. So they add inverted wings to the car to push it down to the ground so they can turn faster, because they don’t slide as much. But the wings also act a bit like parachutes in that they slow the car down, that’s not good on long straights when the downforce is not needed. So to make it easier to overtake you can open a part of the rear wing. You lose some downforce that you’re not using on the straight anyway, but the parachute effect is reduced which means you can go a bit faster than the car in front.
Each track has a DRS zones (numbers differ by track and are on straight bits) where this can be done, but only if you’re following a car less than 1 second behind when you hit a special detection point. You activate it by pushing a button on the steering wheel.
Also the DRS will also be activated when you’re following a car that’s been lapped.
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