The M5 between Bromsgrove and Worcester, I think, is a case worth considering. The hard shoulder has been transformed into a fourth lane. There are stopping points at 1km intervals.
My opinion is that hard shoulders have been a defining point of motorways and a significant contribution to safety. Sooner or later there is going to be a major incident due to the absence of a specific emergency stopping lane. When it happens, watch the hand wringing ...