The section of road in question, the centenial highway on the kapiti coast, has the cheese cutter down the centre line only. There is only one lane in either direction and there isn't a cheese cutter on the left hand side of either lane.
I'm not saying that these things are the bees knees in barriers, they certainly wouldn't be the best choice in all circumstances but on this section of highway I think they work very well.
The road is narrow with sheer cliffs on one side and the sea on the other. There isn't the room to install a concrete barrier as it would narrow the lanes even more and unless they cut away huge sections of the cliff there aint no room to make the road any wider.
It seems to me that the cheese cutter on this section of road has solved a serious problem and hasn't created any new ones, (so far).
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