In Formula One if an accident or inclement weather (typically, heavy rain) prevents normal racing from continuing safely, the Race Director will call for a "safety car" period, which would see marshals wave yellow flags and hold "SC" boards, pending the car in question entering the track. Another notable effect of safety car periods is that racing cars consume less fuel until full race resumption, which can allow competitors to run longer distances on a tank of fuel than would otherwise have been possible and/or reduce the number of pitstops required for the duration of the race. From 2007, all Formula One cars must have LEDs and/or displays fitted to the steering wheel or cockpit, which inform the driver which flags are being waved. With regards to the time limit, the race is being scored and the time is also counting while the safety car is on the track, and the race resumes. This rule was abandoned from the 2012 season onwards, with cars now allowed to unlap themselves before the race resumes. At the same race a year later, Lewis Hamilton failed to notice the red light and slammed into the back of the car of Kimi Räikkönen, who was waiting at the end of the pit lane alongside Robert Kubica.
The 2021 Belgian Grand Prix infamously became the shortest race in Formula One World Championship history and the first (and so far only) World Championship Grand Prix in history to be run entirely behind the safety car with no running taking place under green flag conditions, with two full laps completed behind the safety car before the race was red flagged on lap 3 and not restarted thereafter with results taken from the end of lap 1 with Max Verstappen declared the winner of the event and half points awarded to the top 10 classified drivers. The system was evolved taking into account drivers' feedback and was officially introduced for the 2015 season following ratification by the World Motor Sport Council (WMSC). The system saw its first extended deployment at the 2015 British Grand Prix after Carlos Sainz Jr.'s power unit failed at Club Corner of the Silverstone Circuit. Drivers must continue in formation until they cross the first safety car line, where circuit green lights and flags will indicate they are free to race again. Vehicles in this category are often the flagship models of luxury car brands.
The fans (if they are watching the race on TV) and drivers can hear the Race Director declare the FCY on the radio. The points system was based in general on race distance but not on mileage factor. Toyota released the hybrid versions of the Corolla Axio sedan and Corolla Fielder station wagon in Japan in August 2013. Both cars are equipped with a 1.5-liter hybrid system similar to the one used in the Prius c. In 2002, Toyota introduced the "Variable Gear Ratio Steering" (VGRS) system on the Lexus LX 470 and Landcruiser Cygnus, and also incorporated the electronic stability control system to alter steering gear ratios and steering assist levels. The most savings is for the Toyota Prius, which has a five-year cost of ownership 40.3% lower than the cost of comparable non-hybrid vehicles. This situation may provide a strategic advantage since any scheduled refueling, tire change or maintenance may be carried out while other competitors are lapping at lower speed, and the drivers who pit then simply rejoin a queue of cars all running together. Without lower noise levels that enable residential landings, any PAV must take off and land at an FAA-controlled airfield, where higher sound levels have been approved.
Some cars have a freewheel that disengages the driveshaft from the driven shaft. From 2010, once cars were lined up behind the safety car, lapped cars were no longer allowed to unlap themselves before the race was restarted. The green lights are used to signal that it is possible to overtake the safety car; this is only done until the race leader is immediately behind the safety car and at the head of the queue of race cars following. However, any car which was in the pit entry or pit lane when the safety car was deployed would not incur a penalty. When the safety car and the drivers behind it are on the start/finish straight, there is a red light at the exit of the pit lane. The safety car must maintain a reasonable speed so as to ensure that the competitors' tyres are as close as possible to operating temperature and their engines do not overheat. The system was similar to the Electro-PACER lights used in the Indianapolis 500 races from 1972 until 1978, except that engine control units (ECU) were involved and could enforce speed limits under the current system. The accident panel recommended the implementation of a "virtual safety car", based on the "slow zone" system used in Le Mans racing.
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