To respond to your edit. 19th century London: they razed whole neighbourhoods to construct the Underground. 21st century London: they propose to raze the St P

To respond to your edit. 19th century London: they razed whole neighbourhoods to construct the Underground. 21st century London: they propose to raze the St Pancras estate (with compulsory purchase orders) to build the HS2 railway. But cycling doesn't require razing: the solutions I have given to your suggested problems don't raze a single thing.