When I lived South Carolina, I could drive 100 miles in any direction and the style of regional BBQ wouldn’t even change. Slight shift of the drawl, taller pine trees, and mild variations in asphalt composition, at most. Here in Europe, where I now live, traveling that same distance could entail passing through areas that speak three separate languages, possess varying social attitudes, and have different perspectives on the acceptability of public nose-picking (yes, it’s a thing). All that said—and to my great delight—I had not anticipated such colorful variation in road signage.
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In Italy, watch for the ZTLs (zona a traffico limitato, ie. restricted traffic zones) often found in small towns, or inside the old city walls. Many warnings are easily identified; others, not so much. There is nothing to stop you from simply driving through even if you don't park, but they are closely monitored and you will get a fine for up to $500 through your rental car company.
The Swiss have some great graphic warning signs in the Alps, both for motorcycles and cars. One I recall depicted a motorcyclist with an angel hovering above. The German legend was something like"Don't depend on your guardian angel to save you."
I think I've seen that actually, or something similar. They seem to have those kinds of signs in the black forest, where the curbing also is painted like a race track...
My absolute favorite was a warning advert I saw years ago on a highway in Germany: a picture of the cockpit of a speeding sportbike from the rider's POV with a grinning skull filling the left hand rear view mirror, and the tag line "are you faster than Death?"
Similar experience driving in southern Africa. If I may post a link, these signs appeared in South Africa, Botswana, Zambia, and Namibia: https://photos.google.com/share/AF1QipPfxdZApejeI6djiIATBP84ydqB96Hjc3wN0CjatNwW_GwyvvSztytO-f9_z5vE...