I've also thought about the 'selfish merge' problem a lot. I think the solution is that instead of one lane vanishing and all cars moving into the other lane, both lanes should partially vanish, so you 'merge' into the middle of the two lanes.

I saw this in Brussels once and it really caught me out. I thought the other lane was vanishing so made no attempt to merge with the other traffic, but my lane was also vanishing. It means that drivers in both lanes must be considerate. If I'd expected this format it would have worked very smoothly.

I try to mimic this form of road design in my driving anyway, by intentionally driving halfway between the disappearing lane and the continuing one. I worry that I'm annoying other drivers too much though.