Every country is different, however road signs seem pretty similar everywhere. I have seen my share of odd sign posts in Greece, a few odd ones in Egypt…my point is, generally speaking there are universal signs for drivers, but for added excitement, some unique to each country.
In Portugal, before every freeway on ramp you see this sign. It tells walkers, cyclists, cows and carts they are not welcome. Can the cow read this sign? What about the unmanned cart? Curious. It is a personal favorite.