I managed for 10 years after passing my test at 17 without hitting anything or anyone.
It is only 20 in the centre, and despite yokels not able to understand roundabouts or box junctions (that have not been on place for years), remain the major challenge.
Blind humpback bridges create their own speed limits and amusingly both of these remain at 30mph which makes a farce of the 20 mph clear sighted areas.