Actually, this is a problem that is already solved by smart motorways in the UK (Europe too maybe?). They have a variable speed limit that dynamically changes according to traffic that stop brake waves happening.
Do you not have them in the US?
Do you not have them in the US?
Additionally the removal of hard shoulders is just dangerous.
Lol, why adopt the UK's variable speed limit when we have already de-facto reinvented the Autobahn....