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To save any confusion, my original post highlighted potential problems with other people seeing a flash and misinterpreting them as a give way flash and you might get pedestrians walking out in front of you or cars pulling out. That's all.
Just use common sense, as a flash in a built up area could be seen by a handul of different people, all of whom may interpret it differently.
Waving out the window with both arms is absolutely fine!
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