It is a video near the Takasaka service area of the Kan-Etsu Expressway around 6:10 pm on the 12th.
Trucks are running on the road with splashes of water.
Due to the effects of moist air and cold air in the sky, the atmosphere continues to be unstable over a wide area from northern Japan to western Japan, and rain clouds have developed in the Tokai and Kanto regions, and heavy rain is falling in Saitama Prefecture.
According to the Japan Meteorological Agency, it is estimated that heavy rain of about 100 mm fell in one hour until 5:50 pm by radar analysis near Hatoyama Town, Saitama Prefecture.
As the danger of a disaster is imminent, the Japan Meteorological Agency is calling for the release of "record short-time heavy rain information" to ensure safety.