Angie, you probably have lots of company slipping on a manhole cover. I don't know if this solution makes them less slippery, but you're sure to see them before you step on them. Apparently they're doing it in Bangkok too, according to tonight's NHK News broadcast on PBS.
Articles:
https://www.thisiscolossal.com.....le-covers/
https://www.cbsnews.com/news/s.....le-covers/
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