Why is it that almost all of the new central traffic separator islands intrude so much into the carriageways?

The central bollards are well illuminated and very visible but the extended curbs are unexpected and more difficult to see in conditions of poor visibility. I can see that wider islands may be needed at pedestrian crossing points, but at other locations they present a very real danger to car tyres, wheels and suspension if clipped. Will the council pay up for all the damage? Older style islands were not like this and yet served perfectly well to separate the traffic lanes. The much wider new style seems totally unnecessary and a real danger to motorists. Judging by the black marks on most of them they have already been hit by many vehicles. How many have been damaged? What is the thinking behind these unnecessarily large islands?

John Jenkins, Budmouth Avenue, Weymouth