This is a perfect example of something looking fabulous in theory, and then people getting giddy and carried away without waiting for the actual practicalities to become apparent.
You can imagine it - a whiz-bang computer presentation at the Department of Transport, some guy in red braces with a computer model of a 'smart' motorway, and a fistful of statistics of how much more traffic will move how much faster, and how wonderful it will all be.
But of course, simply realities, like that fact that a huge number of motorists simply do not register a sign that tells than that their lane is closes, and they must move over, now.
That leads to the plethora of fatalities that the original computer modelling did not consider or allow for, because it focused entirely on faster traffic flow, not traffic flow catastrophically halted and backed up by a pile-up as one solitary car broke down in a live traffic lane with no-where to go.
It just needs a brave government to hold its hands up, admit the experiment is a failure, and reverse the construction back to hard shoulders, and safety for everyone.
I am all for fast flowing traffic, but not at the price being paid by people dying to prove that 'smart' motorways are actually anything but.