NASCAR Sprint Cup Series
Before 2001, NASCAR used a two-day qualifying format in its national series. Before 2002 only one lap was run on oval tracks except short tracks and restrictor plate tracks. Since then, the pole position has been determined by a two-lap time trial (one lap on road courses) with the faster lap time used as the driver's qualifying speed. Starting in 2003, if a driver's team changed their car's engine after the qualifying segment was over, the car would be relegated to the rear of the 43-car field. In the case of multiple teams changing engines on the same weekend after a qualifying segment (although this is a rare occurrence), qualifying times from that segment are used to determine the starting order for those cars.
Read more about this topic: Pole Position
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