rocamaco said 
It doesn't matter, he's right anyway and that may help others...
Ok thank you
But it's somewhat difficult to guess who was the first in, if we didn't look at it before, when we just focus on a strange signboard like that with everyone with a STOP at the 4 intersections!
Alleluia
PS. I'd already seen this signboard when I was on holiday in Canada, but didn't understand who should move the first...
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