Grade separated interchanges (like motorway interchanges). The project at this stage is from Dowse to Petone (correct me if this has changed Col). Melling and north is to be included in a later stage of the work (how much later no-one really knows), with the end game being grade separation at the SH2/ Haywards intersection.
Of course, once this starts there will be lane closures etc all along this section of SH2, so just wait for the traffic chaos and start practicing your lane splitting skills.
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