List of red-flagged Formula One races
Formula One, abbreviated to F1, is the highest class of open-wheeled auto racing defined by the Fédération Internationale de l'Automobile (FIA), motorsport's world governing body. The "formula" in the name refers to a set of rules to which all participants and vehicles must conform. The Formula One World Championship season consists of a series of races, known as , usually held on purpose-built circuits, and in a few cases on closed city streets. The results of each race are combined to determine two annual championships, one for drivers and one for  constructors. A red flag is shown when there has been a crash or the track conditions are poor enough to warrant the race being stopped. The flags are displayed by the marshals at various points around the circuit. A Global Positioning System (GPS) marshalling system was introduced in 2007. It involves a display of flag signals in the driver's cockpit, which alerts them to the crash. Following a red flag being shown, the exit of the pit lane is closed and cars must proceed to the pit lane slowly without overtaking, lining up at the pit exit. From 2005 , a ten-minute warning is given before the race is resumed behind the safety car, which leads the field for a lap before it returns to the pit lane. Previously, the race was restarted in race order from the penultimate lap before the red flag was shown. If a race is unable to be resumed, "the results will be taken at the end of the penultimate lap before the lap during which the signal to suspend the race was given". If 75% of the race distance has not been completed and the race cannot be resumed, half points are  awarded. Until , no points were supposed to be awarded if the race could not be restarted and less than two laps had been completed, but starting in this rule was updated to "no points if two laps or less have been completed". Since the first World Championship Grand Prix in 1950, red flags have been shown in 79 races, with the latest one being at the . A total of 26 races were restarted on the first lap, while 13 were not restarted, 9 because of rain and 4 due to crashes involving drivers. Another 5 races were stopped due to  incidents that resulted in fatalities: the was stopped on lap 29 and not restarted after Rolf Stommelen's car crashed into a spectator area, killing five people; the was red-flagged after a massive crash that ultimately contributed to the death of Ronnie Peterson; the was halted on the first lap after Riccardo Paletti was killed when his car collided with the back of Didier Pironi's Ferrari; the was red-flagged following the fatal crash of Ayrton Senna, in which his car crashed into a wall at the Tamburello curve; the was red-flagged for a second time following  a serious collision between Jules Bianchi and a recovery vehicle which would ultimately prove to be fatal.