This is what is used in Russia in replace of the stolen manhole cover.
Stealing iron cast covers is widespread in the country and an unresolved safety + economic + police-inefficiency issue. Thefts sell them as metal scrap for cheap prices.
So that is not an actual replace, but a kind of a fence, a light frame welded of PVC pipes and painted in the warning colors.
More on the issue captured earlier this year in the video format:
Photographed today locally by myself. The text and footage are also original and my own. Copyright (C) 2022 Valerian Kadyshev.
Do ya like this diy idea?