Uonuma Skyline road

Hi,

Can anybody tell me which road the Uonuma Skyline (八箇見晴台) is? Its not marked on my road map and can't find the exact info on the internet. Google map gives me anything ranging from route 253 to route 82 to route 560...

Thanks!

https://goo.gl/maps/JTkGvusvzeG2
http://loco.yahoo.co.jp/place/g-QgAsJqZAi4s/map/
http://www.at-roadside.com/drive/kanetsu/uonumaskyline.html
http://www.bikebros.co.jp/com_images/trp_img/2014/08/15/out_7604_1l.jp...

Raod 560 is old route not wide
and no curve(safety) mirror spot as blind corner a lot be carefull.
http://i.imgsafe.org/f6a8fc9.jpg
http://livedoor.blogimg.jp/bike_riding/imgs/e/a/eafe1729.jpg
(In Japan calling "curve mirror" usual )
This is driving records.
https://youtu.be/p7_c6rfxQFM
Jump to 10:05 (x2 speed play) 10:11-10:13 is so.
https://youtu.be/0VN9KQ_s6uE
Jump to 24:55 (real speed play) 25:05 is so.

Thanks so much for all those links!