There are few greater thrills in motor racing than watching one car overtake another, whether diving down the inside, or sailing the long way around. Formula 1 has a special system in place to encourage on-track action.
The Drag Reduction System, or DRS, was introduced into F1 in 2011 to boost flagging numbers of overtakes. Sections of the track, usually the pit straight and one other area, are designated to using the DRS - where overtakes become more likely. If a driver is within a second of the car ahead while passing the 'detection' point, they can use DRS once they are in the 'activation' zone.