When the 'gyratories' were installed in the 1970s all the roads had traffic lights stopping vehicles for no reason. So they took some of them away, then about twenty years later put them back. Maybe now't the time to remove all the lights except pedestrian crossings and have ordinary roundabouts?
Another way of improving roads would be to have very low urban speed limits of 15-20mph. Obviously it would initially drive people mad, but after a while they'd start to realise that cycling or walking was as fast and much safer. An additional benefit would be in improving health, which would save £millions. Who knows, they might even be enough money to keep the hospital open?