Checking congestion before going out

In large cities in Japan, local governments have issued requests to refrain from going out to citizens, but it is impossible to stop them completely. You have to go shopping for food and daily necessities, and you may have to go to a hospital or dental clinic suddenly.
Then, Yahoo! Japan has re-released the crowd radar function to visualize the degree of congestion in each area on their mobile map application "Yahoo! MAP" and its web version.

They closed this feature on January 31, but re-released it with more features due to the spread of the coronavirus.
The new congestion radar calculates the congestion status from 2 hoursago to 26 hours ago based on the data of users who allow the use of location information in the applications provided by Yahoo! JAPAN indicate. The degree of congestion is indicated by colors on a heat map in stages. By moving the slider at the bottom of the screen, you can check the congestion at each time period from 2 hours ago to 26 hours ago. And when you tap the play button, the transition of congestion status is shown by animation.

If you have to go out due to unavoidable circumstances, you can use this to understand the tendency of congestion around the destination area or stations, and you will be able to avoid congestion and act more easily.
Yahoo! MAP application version is free to download(iOS/Android).