slam525i No need to apologise because that is a fair question.
For example in Sydney, Australia they have spent some many millions of $$$ extending a 4000 metre runway with 90 safety areas at each end! Woopee!
They want to do the same with the crossing runway which is still some 2500 metres long except that it ends at the edge of a river. So rather than declaring that runway 90 metres shorter at each end and declaring those areas the safety run-off area, they want to spend hundreds of millions of $$$ to build a suspended concrete platform over the sloping river bank.
OK I can see the benefits if the runway ends are soft like a gravel trap with a thin crusty sealed surface that the aircraft would break through if it rolled across the surface, but I don't think simply adding an extra 90 metres to every runway out there is money well spent.