Abstract
As a policy which solves city traffic congestion, although maintenance of a ring road is promoted, construction is not progressing in almost all cities. Although under these circumstances Sapporo took the time for about 70 years, maintenance of the ring road which is not a highway was realized for the first time in Japan. The arc road plan in which the reason which Sapporo Kanjo-dori ring road completed was based on an ideal and reality was a factor.Moreover, there was thought of national defense, air defense, and fire prevention in the historical background of the plan.
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