<Tr> <Td> </Td> <Td> The green and white checkered flag is shown to indicate the end of a race stage . After the top 10 drivers cross the start / finish line, the caution flag is displayed . </Td> </Tr> <Tr> <Td> </Td> <Td> The yellow flag, or caution flag, indicates a hazard on the track--most often an accident, but sometimes also for debris, light rain, emergency vehicles entering (usually on short tracks with no tunnel) or a scheduled competition caution (usually used for races that have been postponed due to inclement weather). All cars must slow down and follow the pace car . Passing is not allowed under the yellow flag . NASCAR experimented the "local yellow" flag in road courses; cautions apply to the entire circuit, including road courses . </Td> </Tr> <Tr> <Td> </Td> <Td> The red flag indicates that the race has been stopped . This may happen due to a large accident (such as a multi-car wreck like The Big One, inclement weather), track repair (such as damaged catch fencing), or for severe track cleaning (such as the final laps, when NASCAR may clean the entire track to ensure the race can finish under green flag conditions, and to do so with the track clean of oil from engine failure or crashes). Cars may be ordered into the pits or on the track depending on conditions; red flags for inclement weather generally result in all cars parking in the pits . Race teams are not permitted to repair or adjust cars during red flag conditions . However, drivers may exit their cars, and they may be provided with water, food or other necessities . This flag is also used with the black flag to signal the end of a practice or qualifying session . </Td> </Tr> <Tr> <Td> </Td> <Td> The white flag indicates one lap remaining in the race . More specifically, it indicates that all drivers will be scored for at most 1 more lap after passing the white flag . </Td> </Tr>

How many laps does a nascar race have