I have a suspicious feeling that the highways engineers have started designing them in to "slow traffic down as it approaches roundabouts" but that's just soo wrong as the whole point of a roundabout is to keep the traffic flowing and make junctions and crossing points safer, so erecting these barriers is just madness as far as I am concerned :angry2:

The screens are supposedly to make people reduce their speed because they only get a short time to see if it's clear. Stupid idea.
We also have roundabouts in Nottingham where the lanes leading onto them have had pinch-point crossings and re-radiused by the far-left council so that you enter the roundabout facing to go around in the wrong direction and have to have full lock on to avoid teh kerb on the roundabout and not catching a back wheel on the other kerb.

They put them up on a roundabout where I live in Lincoln over the last couple of weeks. The island is on a dual carridge way with a very busy single lane A road across it.

I think it may be to do with traffic management. So the idea is that you slow down and it gives more gaps for other traffic to join. Cheaper than traffic lights on the Island. In the mornings there used to be a 800 yard queue on the dual carridgeway, Its now much shorter in the mornings if at all.