Part of the difficulty here is that you dont have to exceed the limit to get into difficulty through inexperience.
The view over the section of road is definitely misleading - there are two bends in quick succession - a righthander at the bottom of a steepish hill which snakes down from a lefthander with a 30 mph advisory, which then climbs into a longer lefthander - which then dips again before it climbs up the far side.
Get it wrong in the first, and you carry the error into the second!
The 30 mph advisory is decidedly slow - even the most cautious driver can manage 40 without any discomfort.
It's the speed carried down the hill which is a problem to some, as they go too fast into the righthand, and find it tightens towards the end.... the kink which is shown in the photograph.
It's not even easy to illustrate what is wrong, BECAUSE the view is misleading.
In trying to see what is wrong, I have driven the whole section at 60mph - including the 30 advisory - but because I know the road so well, I experience no untoward events, as I am correctly positioned for every aspect. A flashing warning, or chevrons might only serve to perplex the un-initiated and unskilled driver, and divert attention.
The best answer would be to re-line the road, and remove the kink, at the same time making the dualled uphill lane into a single lane, with hatched central median.
This would solve a lesser potential problem of vehicles who are turning into a farm/guesthouse, who at present have to wait in the middle lane, just around a bend where vehicles launch themselves at speed to pass slower vehicles.
Imagine the view from the left side of the road, and a vehicle waiting to turn right just next to where the red car is.
This is the result of one overenthusiastic Londoner, who appeared to have clipped thefar verge, before over compensating, and uprooting a tree stump and a traffic sign!
In the far distance you can see the top of the hill where the 30mph advisory leads into the downhill section.