1. highway (esp. one existing from the Edo period); main road
2. highway (e.g. to success); path (to becoming ...)See also 出世街道 しゅっせかいどう
Wikipedia definition
3. Kaidōwere ancient roads in Japan dating from the Edo period. Major examples include the Edo Five Routes, all of which started at Edo. Minor examples include sub-routes such as the Hokuriku Kaidō and the Nagasaki Kaidō. Kaidō, however, do not include San'yōdō, San'indō, Nankaidō and Saikaidō, which were part of the even more ancient system of Yamato government called Gokishichidō. These names were used for administrative units, and the roads within these units.
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