It's had merit since it was first floated as part 3 of the original SAM proposal back in 1994. All of part 3 was put on the backburner in 1996 when parts 1 & 2 were signed off, and then it was the only piece of part 3 of SAM that didn't make it through the Nov 2000 signing off of SAM part 3.
In essence, one entry point with relevant immigration and customs checks for both countries done there and one exit point (last point of visit in either country) for both countries done at that point. Effectively turning trans-Tasman into domestic.
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