Single carriage madness

Over the last term and the start of this, I have noticed that there are mainly two types of drivers on the A15 (the road between Peterborough and Lincoln which I use most days during the week) at 7am.
Type 1 are the people that are not happy unless they are traveling at 70mph or above. We shall call these commuters. They hassle anyone going slower then the speed limit and sit on their tail until they can get passed.
Type 2 are the people that do not go above 50mph. We shall call them - the bane of my life! They probably think that they are being really safe and careful. However at that time in the morning all the rest of us get really annoyed with them and try and overtake them, some people getting really frustrated with them and try and overtake them where its not safe - causing accidents. Don't get me wrong - I'm not blaming them for the accidents, if the rest of us had a little more patience and only overtake when its safe to do so, or left in time, then we would all be ok.
Of the type 2 people, there is another sub group: those that go at 40mph. The road we are on is a major A road for flips sack - 40 is just stupid. I get sooooo annoyed with these and do end up yelling something like - "60 is a limit not an aspiration" at them (obviously they can't hear me). These people never overtake a lorry when they see them, making it kinda dangerous for us to overtake them and the lorry. This means that anything slower, like a tractor wanting to join the road often has time to pull out in front said lorry, thus making us all slower!
I'm kinda an inbetween person - mainly to be found going at 60 - like a good law abiding citizen!
The other traffic we get on that road are lorries - who I know can't go over 50, so I can't really have a go at them particularly the faster lorries, and blooming tractors, who again can't go fast, so can't really have a go at them either - they just slow us all up.
The trouble with the A15 is that it is single carriage all the way, and quite a windy, twisty road, so overtaking spots are few - I am getting to know them though. The trouble is that not enough traffic uses it to dual carriage it, which is kinda a good thing, but also really annoying.
Ok, and breath. Right rant over now. So how are you?