A rhetorical question, I know, but if you do see one that needs addressing here’s how to get it fixed. Cycling UK operate a website called https://www.fillthathole.org.uk/ which accepts details of the road defect and forwards them to the appropriate council for repair. You can download an easy to use app for your smartphone too, so you can make the report there and then, at the roadside.
It’s also worth noting that the same site has a facility for reporting near misses and crashes, http://www.roadjustice.org.uk/