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Damon Hill's Williams FW18 from 1996. The FW18 was one of the most successful cars of the era
For example, for a 20-car grid, all 20 cars are permitted to take part in the first period. At the end of the period, the slowest five cars are eliminated and take up the last five grid positions (16 to 20). In the second period, the remaining fifteen cars take part, with five more cars eliminated at the end, taking the next five lowest grid positions (11 to 15). In the third and final period, the remaining 10 cars compete for pole position, and fill grid positions 1 through 10.
The knock-out format has received minor updates since its inception, such as adjustments to the number of drivers eliminated in each period as the total number of cars entered has changed (from 20 drivers in 2009 to 24 in 2010).
The race
The race begins with a warm-up lap, after which the cars assemble on the starting grid in the order they qualified. This lap is often referred to as the formation lap, as the cars lap in formation with no overtaking (although a driver who makes a mistake may regain lost ground provided he has not fallen to the back of the field). The warm-up lap allows drivers to check the condition of the track and their car, gives the tyres a chance to get some heat in them to get some much-needed traction, and gives the pit crews time to clear themselves and their equipment from the grid.
Once all the cars have formed on the grid, a light system above the track indicates the start of the race: five red lights are illuminated at intervals of one second; they are all then
extinguished simultaneously after an unspecified time (typically less than 3 seconds) to signal the start of the race. The start procedure may be abandoned if a driver stalls on the grid, signalled by raising his arm. If this happens the procedure restarts: a new formation lap begins with the offending car removed from the grid. The race may also be restarted in the event of a serious accident or dangerous conditions, with the original start voided. The race may be started from behind the Safety Car if officials feel a racing start would be excessively dangerous, such as if the track is wet. There is no formation lap when races start behind the Safety Car.
Under normal circumstances the winner of the race is the first driver to cross the finish line having completed a set number of laps, which added together