There seem to be a number of drivers that travel at 45mph regardless of road and limits.
I've encountered a number on A roads where visibility etc is good but then when entering a village etc continue at 45 in the 30 limit.
Can't figure them out at all.
This is categorically my biggest pet peeve.
The most infuriating thing for me is I can't/won't speed to then keep up, which is like a double insult.