I can’t think of any real-life situations where I’ve come across a red flag warning — traffic cones though, I’ve seen plenty of those. Maybe NZ prefers high-vis orange as its warning colour? But for those sea captains, sailors, and race-car drivers out there (I’m sure I have a large audience amongst those groups), you’ll be more familiar. A red flag means WATCH OUT! DANGER! SLOW DOWN! STOP!
While I don’t seen many literal red flags, metaphorically I’m seeing them all the time. They’re those familiar patterns of behaviour and those familiar phrases that either fall from your lips or reverberate around your head, and they all mean WATCH OUT! DANGER! SLOW DOWN! STOP!