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In both [[NASCAR]] and [[IndyCar]], a single yellow flag waved from the starter's stand places the race under caution. At this time, a [[pace car]] will enter the course and lead the field at a safe, predetermined, reduced speed. On oval tracks, yellow lights universally supplement the primary flag at the start/finish line. These lights usually operate in a flashing manner, in order to quickly gain the attention of the drivers. The field is locked into place at the onset of caution periods and no one is allowed to pass another car without mutual consent (excluding crashed and immobile cars). In some races, though, cars may pass one another on [[pit stop|pit road]] during a caution period. When the starter shows a furled yellow flag, it indicates one lap to green.<ref name="NASCAR"/><ref name="IndyCar"/>
On road course races in IndyCar, a single yellow flag at a marshaling station indicates a "local" yellow, similar to the aforementioned rules in Formula One. In these cases, the pace car does not enter the track, and the caution period is limited only to that particular segment of the track. Green flag racing prevails around the remainder of the course. Twin yellow flags displayed at the starter's stand indicates a "full-course caution,” in which the pace car would enter the track and the entire course would be under caution. This might occur for a serious crash or other major hazards. NASCAR has also experimented with "local yellows" on their road course events, although a plain blue flag is used instead.<ref name="IndyCar"/>
In the case of snowmobile racing, the yellow flag is displayed at or before the point of the hazard. When a snowmobile racer crosses the yellow flag, the race will continue, however, the skis and track of the snowmobile must remain on the ground.
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