For me the issue is that quite a large number of people seem to drive around at 40mph in a 60mph these days - even when safe to observe the speed limit. Which would be fair enough, but then everyone behind them follows with 1 foot of distance between them so you can't overtake unless you fancy doing a 6 car overtake which will then be caught on half the zombies dashcams
So instead you just join the 40mph queue and quietly fume.