I took a bus on Usui Pass from Karuizawa Station (軽井沢駅) to Yokokawa Station (横川駅) in Nagano (長野県) and Gunma Prefecture(群馬県), Japan (日本).
It’s about 33 minutes of a ride. I enjoyed it a lot, so please check it out!
Please check the video and more details on Youtube below! Thanks!