Same thing happened to me last Monday when the M1 was closed just north of Toddington. White arrows showing in the outside lane, then the outside two, then the outside three and finally crosses in three of four lanes. All of that showing since J10 (maybe J9) and finally closed (line of cones, police etc) at J12 with everyone filing off.
I moved over. Thousands didn't. It took the best part of two hours to get from J9 to J12 having missed my opportunity to escape early at J11..
Same thing again a couple of days ago southbound on the M1 - five car accident (must have very recently happened) in the outside lane so three/four gantries of white arrows followed by two of red crosses. Nobody moved over until they could see the whites of the eyes of the people standing by the cars

(No exaggeration .. people would literally stop behind the last car in the shunt and
then indicate)
Now, I realise we have no police left to do anything .. but given there is a speed camera on every other bloody gantry (because SPEED KILLS!) you'd think the digital cameras could be set to snap the plate of every single person going past the red cross....
But no, because speed is the only dangerous thing on the roads. </rant>