On this direction sign at Wixhausen near Darmstadt, Germany, several destinations use a bicycle highway pictogram. Some of the pictograms have a black background, whereas others have a green background. What is the difference in meaning between the pictograms with a black background vs. the pictograms with a green background?
This sign indicates Darmstadt and Arheiligen with a black-background pictogram, Egelsbach and Erzhausen with a green-background pictogram, and Frankfurt and Langen with both.
From context, it might mean green means finished and black means not finished, but I think that's not consistent with signs I've seen elsewhere, and I would find it an unusual meaning for traffic signs, so it'd be interesting to have a confirmation.