If a second pilot does the same "plan" .... very dangerous, isn't it ?
Nobody knows from each other flying in fog...


Yes. That is the purpose of controlled airspace - to prevent such things by
ensuring that everyone in there under IFR is being separated. Flying IFR in
uncontrolled airspace is not all that prudent, and fortunately not necessary in
most of the US.

Most airports have controlled airspace surrounding them to the ground for the
purpose of instrument approaches.

Jose




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