R299 Naganoken to Adachi-ku, good route or better options?

Strazman

Warming-Up
Aug 1, 2018
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Hi all, new to the forum, looking for feedback on route 299 or other alternatives that follow its alignment. I'm planning a 5 day ride Gifu to Tokyo, I'm happy with most of the route, just not sure about the last day to Adachi-ko. This is the current last day plan:


Anyone know these roads? Recommended or is R299 better? Or something else?

Thanks in advance for any suggestions!