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The Blue Flag
The Blue Flag Is Defined In Appendix H of the International Sporting Code As Follows:

15.2 Blue flag - Stationary: Another competitor is following you close by.

15.3 Blue flag - Waved: Another competitor is trying to overtake you.

While it is important in racing to blue flag slower competitors that are being lapped in a race, it is crucial not to get so engrossed in blue flagging, and forget about yellow and red flags. If there is an incident at the next post which requires a yellow flag, then the yellow takes priority over the blue flag.