The road is part of Shiga Kusatsu Kogen Route of the national route 292, a 41-km mountain road that connects Yudanaka/Shibu Onsen in Nagano with Kusatsu Onsen in Gunma. The route includes the highest point of the country's national roads (2,172 meters above sea level) and offers breathtaking views throughout the four seasons. In winter, it closes between mid-November and the end of April the following year but reopens by the end of April in time for the Golden Week holidays. This is the time when you can enjoy driving through the snow corridor with your very own car.
There are several well-known roads famous as snow corridors that you can drive or walk through in Japan: Hachimandaira in Iwate, Tateyama Kurobe Alpine Route in Toyama, Norikura Kogen in Nagano, Hakkoda in Aomori, etc. This one in Gunma is unique because you can drive your own car through it. The snow corridor can be enjoyed until around mid-June, but please check the road information before you leave home. Aside from the snow walls, you can enjoy flowers along the road in spring and summer and autumn leaves before it closes for winter.
To get a general idea on how to enjoy a snow corridor in English, Japan Guide carries a comprehensive article on one of the most well-known snow corridors, Tateyama Kurobe Alpine Route.
Kusatsu Onsen Tourist Association
3-9 Ooaza Kusatsu, Kusatsu-machi, Agatsuma-gun
Nearby tourist spots:
Mt. Tenguyama, Yugama volcano lake, etc.