When I started driving the NZ open road limit was 55 (MPH) When the first fuel crisis (67?) occurred, the open road limit was dropped to 50 (MPH) plus we got carless days.
Once that was over it went back up to 55 - when metrics came in 55 didn't equate to any nice round figure so it went up to 60 MPH / 100 KMH.
Now local bodies can set limits and the speed is all over the place - anywhere from 30 (eg central wellington) up to 100, but never with any consistency eg one of wellingtons 6 lane, median-barrier divided highways goes from 100 to 70 and back to 100 within 1.5 kilometers (Ngauranga gorge)
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