Speaking personally, if I'm the driver in lane 1 of the motorway, I would have far better vision of what's going on around me that anyone on the slip road, so I, as far as possible, make sure that I can either move into lane 2 or safely back off to let the vehicle from the slip road enter in front if I cannot put my foot down to let them in behind.
One thing I know no-one should do is move back to lane 1 from 2 or to 2 from 3 as you're passing the slip road - I suspect, if the OP is to be believed, that's what happened as those vehicles overtaking the HGVs moved back in when they a) didn't need to and b) is, in my opinion, dangerous as those on the slip road may not see them until its too late. Best to wait until everyone has well passed the slip on.
Not quite to the highway code, but safer I think. Having vehicles at a stop at the end of a long slip road where others at the start of the slip road (who are rapidly accelerating) cannot see them is, in my view, a recipe for disaster.
Of course, better road design by reducing the motorway to 2 lanes as it passes the junction, leaving the nearside lane for the slip off and slip on only, with signs well beforehand, would help, as long as the junction wasn't heavily used.
That is the case with the A1 junctions 8/9 going north, where the slip on from Stevenage raidly turns into the heavily used (rush hours) slip off for Letchworth, Baldock and towards me in Royston on the A505, whereby people chance their arm in lane 2 (cutting in at the last minute) because lane 1 is always busy and queueing. In that case, the problem is the poor traffic light management at the juntion 9 roundabout, giving too much priority to traffic not on the A1 slip road and the long filter left (pre-slip road) lane.
I suspect in this case a dedicated lane for the slip on and only one, but wide lane to discourage overtaking on it (dangerous in my view), but to allow it if a vehicle is broken down would be preferable. It also would help if everyone gave vehicles in front more room.
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