In the UK I had someone almost try to crash into me when continued along a totally empty lane 200 yards before the merge point, while everyone else was queueing in one lane.

So stupid.

I actually think that roadworks people could fix this fairly simply though without requiring people to think. Instead of closing one lane and keeping the other open, close half of each lane - create a new single middle lane, then people won't be able to queue in the "right" lane.

After everyone is in single file you can shift them wherever you want.

Here's what I mean: https://imgur.com/a/rCw4vJ7