The same applies in southeast Asia/China/Japan, for both. It isn't exactly ubiquitous just in Europe.
Not in USA though.
Not in USA though.
As someone who grew up in a rural area, honking before going around turns on small roads or crossing single-lane bridges you couldn’t see the other side of was something we did regularly to avoid being hit.
I don’t experience this as much in larger cities though.
I've never found this in rural Indiana, but I wish it were common practice. I've found people often simply assume no one is coming because there are so few cars on the back roads; very nearly experienced a head-on collision approaching one curve a few years ago.