Warning: this is scary in places. A motorcycle rider cruises through an abandoned highway in Japan. "Abandoned" means there has been no maintenance for years. The road is covered with water, moss, potholes, and earth in spots. There are overhanging branches, broken pavement, useless guardrails, and hitchhikers. And also places where it's difficult to find where the road once was! The road eventually ends about the way I expected it to. -via Dark Roasted Blend
It's not surprising either. The mountains of Japan are full of old roads and trails like this. When a landslide destroys a large piece of a road, they just build a new one elsewhere.
(Don't bother looking this up on English Wikipedia, the articles about the Japanese road system are poorly written and lacking in references. BTW, did you know that all the major divided highways in Japan are toll roads? They're expensive, too.)