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What do you mean? I’m just posting a personal opinion/observation about speed limits in my region.

Opinion? You mean a widely shared and scientifically backed "opinion".

This is definitely a local thing though, that may, understandably, be foreign to foreigners.

You made it sound like a known fact, while in reality it’s just a theory you have.

He thought it was just a theory he had, but it’s actually an observable fact in America.