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Plain blue.
The signal flag meaning a faster competitor is close behind; allow them to pass.
Signals a faster competitor is close behind; allow them to pass.
Contexts: Public information
Addressed to a driver about their position relative to someone else rather than to any hazard, which makes it the only flag in the code that manages the race rather than protecting it.
Contexts: Public information
A plain blue rectangular flag, waved at a driver about to be lapped.