The sign in this photo translates roughly to “No public entry on work site”. Yes, on the left of the photo is a new building development. On the right is a picturesque view of the village of Les Plombieres les Bains in Les Vosges. Two members of the public are visible, and another four were standing in the unfinished building.
Despite the warning sign, the four people in the building were looking at plans for its completion. Normally, if you didn’t want people poking around your building site, you wouldn’t put up plans. You might even fence off the area.
But this is France, where the word “interdit“, which literally means “forbidden”, realistically means “just don’t break anything on your way through”.