Yep. This warning infographic is completely clear:
In either case, the language barrier provides a completely clear and unimpeded avenue for comprehension. ("Lebensgefahr" means mortal danger. Clearly.)
This post's theme word is sitzfleisch, "the ability to sit through or tolerate something boring," or "the ability to endure or persist in a task." Strong selective forces ensure that all fully-matured, adult Swiss residents have super sitzfleisch and singular serenity.