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Zipper merging.
If your lane is closing ahead, it is better for everyone in traffic if you drive all the way to the end of the lane and cut in at the last moment.
Note that this does not apply to exit lanes. The basic rule is if late merging blocks someone from going somewhere, merge early. Otherwise, merge as late as you can.
Zipper merge isn't a thing where I live. It's advised in the provincial drivers' handbook to merge early. Some folks from other provinces are trying to change things but it's too ingrained, been this way for as long as I can remember.
Merging early when at speed makes sense, because you still have a lot of lane left before you have to merge - less pressure, more time, less likely to make a bad decision.
Merging late during slow traffic makes sense, as it allows you to align with gaps in the traffic and for the traffic to make space for you without having to actually stop.
The problem with zipper merges as this person describes them is a zipper merge is SUPPOSED TO get traffic back up to speed. However, when your take on the zipper merge is "up there where the wreck is at the last possible spot I can merge" there's no time for a human to safely merge at speed. So everything has to continue at a crawl.
So the people jumping out of their lane and "zipper merging" at the last second instead of 50 feet out or so end up making things worse for everyone.
The zipper does not and should not be at the point of the physical problem on the road. Just like you should not just drive to the end of the on ramp and at the last possible second merge into the lane on your left without paying attention.
That's what I said?
Merge early at speed, merge late during congestion