About Weaving and zip merging: who yields to whom, and the 300/50-metre rule: which statement is correct?
When zip merging, you may drive as far as possible on the ending lane and only claim space at the very last moment, with nothing wrong with that.
When zip merging, you only need to adjust your speed right at the narrowing itself; you can just keep driving as you were for the 300 metres before it.
The agreement is that every driver on the through lane lets exactly ONE driver from the obstructed lane go first each time — not two or more in a row.
Explanation
trap: the 1-for-1 agreement ignored. Book p.154 - the agreement is that every driver on the through lane lets exactly ONE driver from the obstructed lane go first each time — not two or more in a row