you also forget the hundreds of cameras monitoring that lane.The two key changes that were in the M42 original version but "adapted" in other versions were
refuge areas no longer every half a mile
hard shoulder lane no longer looks like a hard shoulder lane
This was seemingly compensated by coining the name "smart" which is anything but the correct word to describe above changes - cheaper they no doubt were though
M1 isn't too bad. M6 is horrific.You wanna try driving the full length of the M1, its a blast