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this post was submitted on 29 Aug 2023
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The two main ones I think about are zipper merges and space in traffic. The most efficient way to handle a lane merger is to do a perfect zipper merge right at the point of merging. But everyone in the lane that’s ending always tries to merge early, and too many people in the other lane don’t want to let anyone in when they get to the merge point.
As far as space in traffic, traffic jams are actually waves that propagate back though the stream of cars. The only way to end them is to have enough space between vehicles to allow the traffic stream to compress without losing speed. The spaces in traffic also make room for people to change lanes without causing anyone to brake for them. Those braking events are often the triggers for traffic waves.
The zipper merge only works best when there's traffic. If there's no hold up in either lane, merging when there's an opening is best, otherwise you increase the risk of slowdown at the end of the merge.
Also, technically it isn't faster. It's just more space efficient. I do think everyone should do it in traffic though as it is a single easy to follow rule.