National Highway 148 is closed partially from Iwatake Iriguchi Crossing to the prefectural border between Nagano and Niigata from 4:00 p.m. on 1/24 (Tue.), because of the heavy snowfall. National Highway 148 between Nagano City Okura Chuo and Shinanomachi Shinetsu Ohashi is also closed.
You can also check the closed highways which is marked black on the map at the website of JARTIC.
⇒Check the highway information in Japan (JARTIC)