We were in the South Island this time last year, and crossing from the east to the west after the National Road Cycling Champs had finished, we passed this/crossed over it.
We didn't stop to ride it, of course, as the trailer was filled with road bikes, but I said to my partner that I would love to ride this one day.
Stunning country, SnowTulip... if you are that far south I would def reccommend you pop it on your agenda