Normally a flagger/marshal would hold the yellow in his hands all the time (s)he is on YF duty and won't need permission from race control to display the yellow flag - or hit the light button/switch for that matter. Or at least that's what I'm used to on both sides of the Atlantic.
Having the flag in your hands all the time is one of my basic instructions to new flaggers/marshals. Imo the yellow is the most vital of the flags to be shown instantly to the drivers, there is no excuse for displaying it with a delay!
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