I have - so what you're trying to get across is that the only difference between culture (driving or otherwise) in first and third world countries is in lack of necessary regulations in third world (traffic signs included)?

I call bullshit on this.

What does make a difference IMHO is having as few rules as necessary - BUT making sure that those few are sensible and respected.

Thus - "Don't be a jackass" is a worthy and sufficient rule - if enforced thoroughly.

Moscow is as full of signs as it was 10 years ago, but nowadays people drive better because the fines have skyrocketed and the overall culture kind of increased.