i do understand NJ.
i am well aware that warning lights and klaxons mean stop, or as you say if you are already on the crossing, to get off it quickly - a warning that they are about to come down...
i think you may have misunderstood the point i was making, though I probably wasn't that clear.
i have however, just reread the op and now noticed he says 'as they are going down' though, so my point is irrelevant anyway - i had not noticed that and thought he meant when the light had literally only just started and the barriers had not yet started.
if you attempt to cross once the barriers are moving then yes she deserves the fine and is an idiot.
if you are correct about the 8 seconds thing though, i admit that i did not realise that, and the following explanatory comments are made in the belief that the whole thing happens quicker than 8 seconds - to me it has always seemed quicker - which is why i wouldn't dare try to go through and why i couldn't imagine anyone else being able to make it through without getting trapped.
i thought they made it very fast so that people would not even dare risk trying to get through, because they would not think there was time.
so my original point was that she must have already practically on the crossing if she could make it across safely at all, basically that she was past the stop line, and in that circumstance the lights are a warning - she was too far to slam on suddenly, or stop and reverse etc.
i thought it was pretty hard, almost impossible, to go through the crossing when the red lights have been on for a few seconds because the barriers would surely come down too soon and trap you if you are any distance away - i did not think it possible to make it across unless you were already on them, and the fact that she did it meant she must have been pretty close, and therefore hadnt committed an offence.