If we do this (and we should) we’ll need to undo a lot of substandard road works and additions. Plenty of roads built to design speeds that would support 130km/h or more and then modified in ways that drastically drop that speed.

Victoria’s approach to shoulders on highways and freeways springs to mind. Likewise the biker slicer tensioned wire fences. What they catch at 100km/h they’ll start to roll at higher speeds as they already will do with 4x4s and SUVs.