A conundrum - 'please explain'!!!!!

I am reliably told that the series of speed humps along McKinnon road, those passing the high school - have suddenly and mysteriously been ripped up and are now gone - vanished, disappeared, banished into the dustbin of history! Now after spending a fortune installing them, recent resurfacing of the road, not to mention protecting all the little kiddies who attend McKinnon High - why have they gone? Is this another example of the genius of Glen Eira clowncil's traffic management? Will they be replaced? If so, at what cost? and why were these perfectly good speed humps then removed after probably only about two years? Which Einstein makes such decisions? Can anyone provide the answers?