Route 418 is national highway. This road starts from south shinano village of Nagano prefecture, ends Neo village of Gifu prefrcture. It drops in Tenryu village of Nagano pref, Ena city, Seki city of Gifu pref part of the way. I can not expect user who uses all section. The user use this road as connecting road both area and area. I probed for Tenryu village~ Anan town at this mission.
The width of this section is about 1-line. But, many local people uses this road, there are many traffics. The large car don't run. I think that stranger's car enters, passing each other will become hard.
This road run alone side the Tenryu river, narrow and winding point is high. There are many section that running under the steep cliff. So, The shoulder of road's surface is bad. And, curve mirror is few, you will need attention when pass each other.
Dangerous degree for big motorcycles
If I run......I'm scared.