Most common

I can't believe no one has complained and had stupid metal drain covers replaced.
They're right in the cycling line on so many streets.
In Oz they use concrete lids or lay tar over the metal ones.

have you also noticed that some drains, the ones nearest the curb have a perfectly sized channel/slit for your 25c tyre ? They are equally bad....
really is piss poor design to the bikers, why can't people design such things with some ounce of thought ??