Road Signs
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Zipper Merge in Germany
Wow, what a concept and Reissverschluss (Zipper Merge) signs actually exist there.
I've been doing it all wrong for years by merging in well before the end as shown by the red cars. What this does is enable drivers from further back to jump the line and move further ahead when it isn't their turn.
The green cars are doing it right. Traffic fills both lanes till the very end and then the zipper merge takes place.