I think the crux of this matter, is JEC cannot understand why all people do not drive like JEC!
You really have to remember that the driving test in this country allows drivers to obtain a license, to drive 365 days a year, 24 hours a day, in rain, sleet, snow, fog, ice, light, dark, wind, hail, on motorways, rural roads, urban roads, mountain passes and "Lincolnshire flat for 20 miles" roads - often without any previous experience of many of the above whatsoever.
A typical example was my brother, a Star Rider scheme instructor at the time, came to visit me at college in Blackpool, and was taken completely by surprise by a tram where they share the road by the Metropol Hotel!!
JEC's aproach would seem to be "what a plonker" instead of accepting that not everyone has seen a tram coming towards them in the middle of the road - especially if you live in Cumbria!!

This is why education is so important.
Perhaps like myself, JEC employed COAST skills without knowing they had a name - but again, many drivers need to be reminded and taught these skills - and taught to PRACTICE them. Not all drivers are the same - as JEC has realised!
Unfortunately, imposing speed limits to make roads safer these day, is a bit like keeping your children indoors, rather than teaching them to treat the roads and the traffic on them with respect. The end result is one day they slip out and get injured, because they didn't know what they should be doing!

This is why
I use the word education so often.
Yesterday I emailed Radio Cumbria about the 4x4 drivers who were making fools of themselves in the deep snow we have had. My comments were read out on air, and invoked a storm of protests from drivers who said they COULD drive in snow - but this picture
from the BBC site showed a typical example of a driver who thought ALL WHEEL drive would be the answer to his problems.

Other drivers contacted the station to say they AGREED with my observations, and I challenged the BEEB's Cumbria station to do something about it.
Today, they had an off road driving centre giving advice on driving 4x4's in the snow and ice - and how to make best use of the features available!
This should be done BEFORE the snow, on a national basis!!

In the view above, the straight road, with central median near the filling station and protected turning lanes is
40 mph.It used to be NSL with three lanes.
The side road which leads off left, just ahead of the furthest car, is 8-10 feet wide, and twists and turns between trees and bushes, limiting visibility to just a few yards. Its limit is
NSL!.
What on earth were they thinking of!! It's no wonder drivers have no respect for speed limits!

interesting points raised here, i do accept your point about the value of education - my point is that the ones who drive the most dangerously possibly tend towards a less than respectable character - joyriders, car thieves, general scumbage etc.. granted there will possibly be a smaller proportion of respectable people in there as well but the thing is these people generally won't listen in the first place - an interesting read may be Bike magazine doing a feature on 3 speeders who took a advanced course - the 'lad' of the group didn't want to know and thought he was better than everyone. i suggest this happens all over the place and is probably the highest risk crash group who all the education in the world won't make a blind bit of difference!
i think speed cameras are somewhat of an 'education' to these sort of drivers who know they are going to lose their licence! the counter-argument to this is "but they will then drive uninsured, etc" but does anyone actually have any proof/figures that uninsured driver convictions are decreasing, or is it something we all assume 'must' be a side effect of speed camera policy?
regarding your speed limits, i know the road i think.. A590 in Cumbria, looks like the Ings road, been up there many a time on my bike. as a counter point to the NSL 'madness' road, surely this is what you are striving for, a road which allows people to select a safe speed for the conditions with relatively little risk of enforcement? is it even possible to achieve 60mph there?
while straight roads generally offer the greatest visibiility, the risk associated with driving fast can still be very great and often not immediately apparent.. they possibly reduced the limit there due to the risk of people rearending those turning into the petrol station and also the crossroads. further on the road turns back into NSL in both directions doesn't it where there are fewer hazards? (eastbound - dual carriageway? and then westbound the hilly section)