|Zip Merge |
Merge in Turn
|Merge in Turn sign approaching Kincardine Bridge|
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A zip merge is a section of road where two lanes merge into one, using a merge in turn system, whereby vehicles travel in both lanes up to the merge point and then only merge down to one lane at the merge point.
The purpose of this is to use all the road space up to the lane drop, preventing long queues in lane 1, potentially back past any warning signs for the queue, while lane 2 is empty.
In the UK, these are typically signed in more urban locations, often after traffic lights or roundabouts. In many countries, however, more use of zip merging is made, particularly at permanent or temporary lane drops on urban and rural motorways and dual carriageways.