You are reading a single comment by @ian(conker) and its replies.
Click here to read the full conversation.
ian(conker)-
Authorities often go around just before a closed road bike race/ running race/charity event with people walking briskly and put down basically skateboard grip tape on them. Can last upto a year.
Alternatively mix cheap gloss paint with random sharp aggregate and paint it on when dry, always works for us with bike trails that have slippery wooden features (and stone sometimes).
BrickMan
Unfortunately, there's not a lot that can be done if the existing infrastructure below ground requires that the cover is where it is. Rebuilding what's underneath can be pretty expensive, and the origin of this bad design may be centuries ago. :(
(It's a problem for bike riders in the main, and people who don't ride bikes usually have no idea it is even a problem, so you may get bad design like that even today.)