I guess the rules for driving should be pretty international. When I was in England and Ireland I noted the traffic signs mean the same thing as they do in the US, but the signs don't have writing on them. They're just symbols. Our "yield" sign is their "give way" sign. Of course, I don't think that a country as different as Japan would have a sign that means "you can only turn left here every third Wednesday of every other month, and be prepared to merge into the other lane". That would be too crazy.
In the US, you do have different signs depending on the state. My state has "Bridge ices before road", and the states around us have the same one but it's worded differently like "Bridge may be icy" or "watch for ice on bridge". That kind of thing. People from other states have never seen that before, and where I live that sign can be misgiving because of the wording. My uncle lives on the other side of the country and he didn't know what to do when he saw that sign. He started yelling "What do I do? Where's the rest of the information??" and started slowing down and making people pass him, causing him to yell at them "Watch out! The bridge is gonna do something!" I've never seen someone freak out like that over a sign.
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In the US, you do have different signs depending on the state. My state has "Bridge ices before road", and the states around us have the same one but it's worded differently like "Bridge may be icy" or "watch for ice on bridge". That kind of thing. People from other states have never seen that before, and where I live that sign can be misgiving because of the wording. My uncle lives on the other side of the country and he didn't know what to do when he saw that sign. He started yelling "What do I do? Where's the rest of the information??" and started slowing down and making people pass him, causing him to yell at them "Watch out! The bridge is gonna do something!" I've never seen someone freak out like that over a sign.