
the thick black line on the left is the Saar, the light one is the city highway and the right street is the Franz-Josef-Röder street. The building on the right is the Landtag des Saarlandes (parliament of Saarland).
a photo blog about the city of Saarbrücken
that could have been another possible photograph for May theme day but I have no idea what these numbers mean. They are on the ground on the asphalt of the sidewalk.