“A most welcome sign on the German Autobahn:”
It would have helped if you’d hinted for us non-Autobahn folks what that sign actually _means_ ... :)
I’ll take a guess. Looks like a round sign that would normally contain a number that represents a speed limit. But there is no number, and the 45-degree “slash” (usually intended to mean “no [something or other]”) is supposed to mean “no limit”?
Just wonderin’....
Sorry about that... you're right that I should've explained it.
That sign is the symbol for "no maximum speed."