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Absolutely. I never did the full marshal training, only helped out once at a CCH race, but as an assistant I had a quick run-through of all this.
It was here, not far from the finish on a sprint stage (Stage 2):
The hazard he seemingly intended to flag was the divider on the approach to a roundabout, where the peloton had to turn left:
I don't know if the Tour de Hongrie is run on roads fully closed for the race, but at a place like this, at minimum they should either have put some barriers down to gradually narrow the carriageway--or narrowed it all the way along. What never works is having such narrowings very suddenly.
On a side note, the English version of the race web-site is very charming.
We were always instructed to stand off the road and flag the turn but don't get in the way of riders or cars, race route or not. You had to do an actual training course to be able to stop traffic. Stand behind something solid if possible, not in front of it. What's that thing about common sense not being so common...