The Irohazaka slope winds through the fall foliage in this Nov. 1, 2020, file photo taken from a Mainichi Shimbun helicopter in Nikko, Tochigi Prefecture. (Mainichi/Kentaro Ikushima)© The Mainichi ...

They connect the lower elevations around central Nikko to the mountainous Okunikko region and ascend as high as 440 metres. Motorists go up on the Second Iroha-zaka and down on the First Iroha-zaka.