Literally. There was no one on track.

The Yellow flag is possibly the most important and most used flag during a race.  It is used to inform the drivers used to direct the drivers about an immediate danger ahead, such as a collision, breakdown or obstruction on the track.

The Driver is required to reduce speed immediately and be prepared to take avoidance measures once the yellow flag is sighted. Racing resumes once a green flag is waived, usually at the marshal station immediately after the obstruction has been passed.

In addition to the yellow flag, tracks often signal with a flashing yellow LED light.

Andrew Burden

The author Kiwi F1 Fan