The International Motorsports Federation (FIA) has published the areas where the adjustable rear wing (DRS) will be detected and can be activated during the Austrian Grand Prix at the Silverstone Circuit, the fourth valid of the 2020 Formula 1 season.
Silverstone Circuit – British GP 2020

The first detection zone is located 25m before curve 3. The first activation zone is located 30m after curve 5.

The second detection zone is on curve 11 and the second activation zone is on curve 14.

The Formula 1 sports regulations establish that the Drag Reduction System (DRS) can be used in the places established by the FIA, both in free practice, as well as in qualifying and racing. In the latter it will only be put into use after the second round.