DRS — Drag Reduction System

The Drag Reduction System was introduced in 2011 to help create more overtaking in an era when aerodynamic downforce was making it very difficult to follow closely. When activated, the rear wing's upper flap opens by about 50mm, reducing drag significantly. The effect is most visible on the speed trace as a flat plateau at the top of the trace — the car is at maximum throttle with less drag resisting it.

DRS can only be used in designated zones — usually one or two per circuit, on the longest straights — and only when the driver is within one second of the car directly ahead at the detection point (usually the end of the previous corner). The gap is measured at the detection point, not continuously; a driver who is 0.9s behind at detection gets DRS even if the gap grows to 1.2s by the time they reach the activation zone.

The strategic dimension of DRS is interesting. A car with strong engine power and a low-drag setup benefits more from DRS. A car with high downforce and a powerful engine might actually prefer to stay close and use DRS rather than try a risky move in the braking zone. Teams sometimes deliberately slow down into the detection point to stay within a second of the car ahead, keeping DRS for the next straight.

DRS is disabled in wet conditions (it reduces stability at speed), and it doesn't work in the first two laps of a race or after a Safety Car restart. These restrictions often produce the most intense racing, because drivers who would normally rely on DRS have to find other ways through.

Look for the green highlighted zones on the Telemetry Explorer's speed trace — those are the DRS activation zones, and the flat-topped peak in each zone shows the extra speed benefit.