Meter(?)-gauge tramlines, very long, straight tree-lined avenue, orientation SW-NE, trees at left in flower, Frenchflags, GIs in casual mode = Tunis? 1943? May? Avenue Louis Braille, about 3 pm?
Sorry, can't say which day!
But I'll continue guessing: it's after the victory parade on 20th May 1943. Troops dispersing, no longer all going in the same direction, watchers on balcony turning away (time for an aperitif?).
Of course, I may be wrong.