Saw this sign at a station and wondered what the sheet metal plates at the bottom are for?

Title basically. The metal plates make no sense at all. The wind will topple over the sign more easily?
And do you know what else makes no sense? A 250 character rule for simple things like this. Also, you can’t post photos to /r/askswitzerland. Maybe today is nonsense Saturday.

by KapitaenKnoblauch