Patience is a virtue.
Yamagata drivers are the worst. If they’re not cutting you off, they’re either traveling too slow, or doing something like eating or using their phone while driving.
The problem’s so dire any effort at changing things would be a rain drop in a bucket. So you should leave it.
It’s so bad you have to constantly be on your toes. When it comes to driving, this is by no means a bad thing. It also means you can’t get angry, which when it comes to driving, is by no means a bad thing. If you get angry at one person, the next person is only going to escalate the anger, and you’ll be the one who loses out.
Best just to learn to forgive and forget, and move on.
As in life.