Bulettehuskeliste på nettet

When I came back to Saarbrücken I found this sign at one of the many fences which keep passengers off the never ending construction site (It says: "Please do not feed"). I wonder whether the sign was put up in order to keep the contruction workers from falling asleep with full bellies? After all they have been working on and at the Saarbrücken main station since before Christmas...