The model: Weaving and zip merging: who yields to whom, and the 300/50-metre rule
The other way around: the merger yields to the exiter (Book p.153) — because mergers drive more slowly and have more overview. Zip merging follows its own rhythm: at 300 metres before the narrowing you adjust your speed, and only at 50 metres do you actually merge, without braking, one driver at a time (Book p.154-155).
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