There can be only one driver in pole position in any given race. Pole position refers to the first place starting position in the starting grid of a formula one race. Since there can be only one driver starting in first place, there can be only driver in pole position as well.
A Grid refers to the position on the race track that the racers would start their race with. The person starting first is said to be on Pole Position or No. 1 position. To determine the position in which the drivers would start their race, usually on Saturdays a qualifying event is held. During this, the drivers have to drive as fast as they can around the track for one fast lap and the driver who can set the fastest time would start on Pole. This includes a number of other rules and criterion but in short, the fastest driver during qualifying starts on pole during the race on Sunday.
In a single race, there can only be one driver who starts from pole position. Pole position refers to the 1st place on the starting grid. During the Qualifying sessions, drivers go around the track and set the fastest time possible. The driver who was fastest during qualifying gets the pole position. Timing is usually correct to 1/1000th of a Second and so, there is absolutely no way two drivers can finish with the same time. So, only one driver starts from Pole Position.
There are a total of 11 teams in the 2013 formula one season. Each team can field 2 race cars per race which means 2 drivers per race. So, a bare minimum of 22 drivers will drive in the 2013 formula one season. If any driver is injured or replaced mid-season then, the number might be even more. As of now the list of 2 drivers per team is published and can be found in Wikipedia or on the internet.
In a Formula 1 racing year there are usually 8 - 10 teams each with 2 drivers racing for every race. That makes around 16 - 20 drivers in each race The 2009 season has a total of 10 teams and 20 drivers competing in each race. This number may vary each season as teams may leave the F1 group or new teams may join the group.
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Pole position is the first (front) position on the starting grid. The driver with the fastest qualifying lap gets to start in pole position.
They currently have a set maximum number of 43 at every race.
The first race of the 2010 formula one season was the "Gulf Air Bahrain Grand Prix". It happened on 14th March 2010. Sebastian Vettel started the race on pole position in his Red Bull but Fernando Alonso in his Ferrari won the race. The 2010 season was closely contested and both Vettel and Alonso fought closely with Vettel winning the drivers title by just 4 points.