The Arai Barrier, located in Kosai, Japan, is a historically significant checkpoint that dates back to the Edo period. It was one of the main barriers established by the Tokugawa shogunate to regulate and control the movement of people and goods along the Tōkaidō, the primary route connecting Edo (modern-day Tokyo) with Kyoto. Serving as a crucial point for inspection and taxation, the Arai Barrier helped maintain internal security and manage the flow of travel during a time when the shogunate sought to consolidate its power.
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