Also, it's also a reminder about what your local emergency services have to look at and deal with on a daily basis. They do such an amazing job (perhaps too good) of hiding the reality of serious and fatal collisions from members of the public, that they don't get the appreciation they deserve. Just remember, when you see on the news the 30 second snippet that there was a fatal collision, it could have involved someone burning to death in a car, someone hideously maimed, someone who was alive talking to the emergency services for some time before dying, or someone who was calling out for their mother before they died - it's ridiculously traumatic and it's only when you see "normal" member's of the public reaction to this sort of stuff, you realise what fortitude the emergency services have to have to not only not let it affect them, but then to do a job, search a body, and tell the relatives. Often at these collisions, there are "normal" members of the public who are fainting, in hysterics physically and uncontrollably shaking - but your friendly emergency services have to just get on with it.
I think that is part of the reason (probably more so than just enforcing the law) that a lot of police officers tend to have very little patience with drivers who clearly don't understand the risks and refuse to understand why the officers may not be happy with them speeding, or with their "minor defect", especially when there is anything wrong with the vehicle belonging to someone speeding.
I try not to speed, but generally won't get too upset with people that speed a bit, however I've seen people complain about the "silly low limit" on some of my local roads and I know exactly why that limit is "silly low", as I've passed the rememnents of past crashes, seen the holes in the hedge, and in some cases knew (vaguely through friends/family) people involved in some serious crashes, and many more potentially serious ones (one of the roads is now a 40, but when it was national if you knew it you were imo insane to do 60 on it much of the time due to blind bends, unexpected surface water, mud, or in dry weather sand coating the surface*, and that's before the chance of wildlife).
I also use the A5 regularly and the number of crashes on that is at times pretty insane, I've personally seen a couple of cars over turned half way down a slip road from one of the roundabouts (other cars, including a couple of damaged ones effectively blocked the turning off), and I've lost track of the number of new bits of car that pop up and you notice if you're using it daily, sometimes quite large bits that have obviously been missed by the clean up crews.
IIRC Two people died over new years when it appears they didn't notice/couldn't slow down enough as they approached one of the very clearly marked large roundabouts and from what has been reported dukes of hazzard'd it

(hit at speed, took off and I believe died on landing).
*It's hilly, winding (with sharp turns), wood on one side and fields on the other, and there are/were at least two sand quarries that had vehicles using it, not to mention farm vehicles. I know several people that hit deer/badgers in the last few years on it, and one of my mum's friends nearly died when a badger wrapped itself around her front wheel as she approached a turn with a drop just past the border hedge (my neighbour had to do some fairly hefty repairs, and he was only doing around 30 at the time of impact).