It might be worth thinking for a moment about which speed limits we have, and why we have them.
When motorways were first introduced, with the (A6) Preston By-pass, there were no speed limits imposed on users. Think for a moment that this was first opened in about 1959, then think about the kind of cars that used the roads then. Typically, the most common were the Morris Minor 1000; the Ford Anglia; the Mini; Hillman Minx. Most of these cars had cross-ply tyres, all round drum brakes with no servos and headlights that would be disgraced by a modern LED torch. There were also quite a lot of cars around then that were made before WW2 and many that, although being made since then, were little more than continuations of 1930s designs that had just been in mothballs for several years and as such had no brakes on the rear at all. All of a sudden into the middle of this were press reports of Jaguar and Aston Martin using the soon to be opened M1 as a test track and reputedly hitting 150mph.
The only safety factor in play at that time was the fact that there was comparatively little traffic. But you also have to remember that there were almost no street lights on motorways until the '80s or '90s and in the '60s the name of Armco was only really known on some race tracks and even then, not all of them.
After all the headlines about E-Types and various DB models travelling at over twice the speed of most other traffic it was decided to introduce a 70 mph speed limit. But that limit only applied to motorways. What we now know as the National Speed Limit sign actually meant No Speed Limit. This meant that the local authority had decided not to apply a speed limit on a particular road. It was left up to the drivers to make their own decisions as to the speed they traveled at. At that time poor brakes weren't really an issue as many cars struggled to get up to enough speed between the bends to actually crash into anything. But this still meant that a car could be driven along a single carriageway road faster than on a motorway. The National part of it meant that wherever that sign was seen the limit applied to the kind of vehicle rather than the road.
The reason I mentioned the use of signs was because, generally speaking, if you drove along a road and there were no signs, advising for instance of bends, then there was no reason to reduce speed. Thus, if in 1975 I was driving a Viva HC, a contemporary car, I should be able to tackle that road with no reduction in speed. A Bend sign would mean slowing down a bit, and a Sharp Deviation sign would mean slowing down quite a lot.
A white arrow painted in the centre of the road should, in theory, mean that the road was about to bend to the left, or right, depending on which way the arrow pointed. In actual fact it was usually the opposite way. An arrow pointing to the left usually meant the road would be about to bend to the right, and vice-versa. The true meaning being that the driver should keep, or return to the left.
The word "Slow" painted on the road would usually be put there to highlight a "Hazard you can't yet see." For instance a concealed entrance or a junction that was in a dip in the road or just over the brow of a hill. An urban road less than a mile from where we live has "Slow" painted on the road four times in less than 200 yards. There are three driveways and a side road, none of which are easily seen as you drive along the road.
There have been plenty of times though in recent years where I've been driving along in the Panda, seen, for example, a "Bend" sign and slowed down, only to then wonder 'What happened to the bend?' So my earlier comment was made in reference to local councils over-doing it with the signs, so much so that bends that modern cars really don't need to slow down for are festooned with signs. Eventually, drivers may start to disregard signs on approach to hazards, only to find the only one for miles around that you really do need to slow down for.
While I (sort of) criticised MEP for ending up on the wrong side of the road, it certainly appeared as if there needed to be more warning of exactly how sharp that bend was than a single Bend sign.
Perhaps when dealing with bends on rural roads we should think of a couple of motor racing maxims:
1) Slow in - fast out.
2) Never go on the "gas" until you know you won't have to come back off it again.