@Ron_C You use Naples as your example in Europe LOL?! We call that the third world of driving in Europe in my family. I have never been there, but every relative I have that has been there says it, including my BIL who is from Treveso outside of Venice, he compares it to living in Dom Rep.
I find each state in America to be different, part of the reason I was wondering where @snowberry lives.
When I lived in Raleigh, NC they were some of the most curteous drivers I had ever been around, always letting you in, but the road system was not very good in my opinion.
In Memphis the drivers suck for the most part. They are loath to use a signal, don’t let people in, and when I ask why people don’t signal they say, “because if they see I want to get over they will speed up and block me.” What kind of horrible thinking is that? I see people not stay in their lane more than do stay in their lane when turning.
Living outside of DC growing up (so that is 25 years ago) people let you in, they stuck to their lanes when turning, they went immediately on a green arrow, they took turns when feeding onto a road that was congested. I felt it to be rather orderly, although the driving was fast, especially on the highways/Interstates.
Michigan was great for following the rules of passing on the left and staying over to the right when not passing, although people seemed to drive very fast on the Interstates in MI also. Of course the MI left is an unusual thing, but I think it is more of a problem for people from MI to drive in other states than the reverse. Although, last time I was there I could not remember if I could complete my turn on the red at one place. I had been away so long I could not remember the rule.
Florida has a lot of tourists so you see crazy stuff on the road, like people suddenly cutting across two lanes because their turn came up, or they are driving very slowly because they don’t know when to turn. Many people from the islands who never drive above 50 have a hard time driving in the congested fast moving interstates and turnpikes, and NYers who rarely drive except while out of state sometimes are overwhlemed also. One of my bosses from NYC would drive 45 on the Interstate and it was frightening to me.