National Route 146 is a national highway of Japan connecting

Naganohara, Gunma 250px, New Naganohara town office 250px, Festival at Kawahara onsen is a town located in Gunma Prefecture, Japan. , the town had an estimated population of 5,495 in 5630 households, and a population density of 41 persons per km². The total area ...

and

Karuizawa, Nagano is a resort town located in Nagano Prefecture, Japan. , the town had an estimated population of 20,323 in 9897 households, and a population density of 130 persons per km². The total area of the town is . Karuizawa is one of the oldest and most ...

in Japan, with a total length of 30.2 km (18.77 mi).

References

146 Roads in Gunma Prefecture Roads in Nagano Prefecture {{Japan-road-stub