When I had my blowout a few days, Mr AA man said that one should never change a tyre on the hard shoulder of a motorway. He knew of AA men and AA 'customers' who had died whilst trying to do so.
On the M1 today, there was a van on the hard shoulder with the drivers side rear tyre being changed. Along with the person levering up the van (less than a yard from articulated lorries doing fifty to sixty speeding by) there was five, yes five, men standing and watching the tyre changer's efforts. Do people not have any sense?
Further on, there was Mr RAC man doing the same on another vehicle.
The advice is simple. You have a blow out on the motorway, get the services to tow you to the next services and then change the wheel.
Otherwise you are a statistic waiting to happen.