In the meantime on a short trip between Wgtn and Foxton of 100km listening to Nat Radio 101FM we have to change frequenchy 4 times or just leave it on AM. Any classical requirements are covered by an old ipod in the glovebox.
You have the wrong sort of car radio then - both RNZ National and RNZ Concert send out signals on FM that allow car radios to automatically switch to the next frequency when the old signal gets too low. My ancient Nakamichi does this, and it should be pretty standard on most modern car radios by now, except for the very cheapest ones. If your car radio displays the station name, instead of the frequency, then it probably has this capability too.
This whole idea feels like KiwiRail trying to turn off the North Island electrification. A really stupid idea with no chance of a good result. So I hope the outcome will be the same - the Government putting in a bit of extra money and getting them do to it right. In this case, maybe by setting up another FM network if it really is a good idea to have a public youth music station.