For Toyotomi government to do communication between Hizen Nagoya and Kyoto Osaka and transportation quickly at the first time of invasion of Korea, a land route and a seaway were maintained and a system of long-distance communication and transportation was built.
I described this institutional purpose, the reality and the influence which gave it to several daimyos by analyzing much history material about this system and considering the process until it's legislated, the modal contents and the actual practical use situation deeply.