How horrible as a driver on a good run is that feeling as you see your car flipping over and then realising that the marshall hasn't spotted it - i agree that revving is wrong as someone's trying to put their hands in but as others have said sometimes you HAVE to do something to get attention, and shouting just confuses people as they don't know which direction to look in!
I think one sharp Blip and locking of the brakes really doesn't do any harm, it's when people are on full throttle as you're picking it up that it annoys me......
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