Four times in the last few weeks I've needed to go places on the motorway in different parts of the UK. Every time there has been some sort of delay. One time it should have been a 25 minute journey that took me 55 as I had to come off the motorway and detour. Another was a 20 minute jam for no discernible reason. I did a longer trip of around 100 miles and in that time there were 3 lots of congestion. A lorry hitting a car, a broken down car and a jam of 18 minutes caused by lorries overtaking and middle lane drivers clogging the whole system.
Tonight my satnav twice warned of traffic situations on my way to a friend's so I came off the motorway and was 20 minutes late.
I find it absurd that a motorway should work very effectively with people driving along in a straight line and periodically going around one another but actually you always need to allow much longer than you really need. I think volume of cars is a problem but I honestly think much of it is terrible driving. People driving too slow (55 ish) not overtaking properly and moving back in, then the tailgaters so they haven't got the stopping distance when things do happen.
It's starting to really annoy me that you can't ever just plan to anywhere.
Aibu to think a second part of your driving test on the motorway should be compulsory.