what are the small square caps on the street, that can feel like mini potholes?
One may have said gas. There seems a few different sizes or types.
they make biking harder for me, with being not easy to see, at least when riding - but still deep enough for a significant bump. More difficult and maybe deeper than the typical big round metal caps
I noticed them increasing, in lower Manhattan at least? But I didn't understand if there's patterns to them, that could help me understand when to be more aware of them?
Are they risky, or causing bike issues?