The Building Standard Law requires site corner-cutoff at each crossing when constructing a building with new road, while it doesn't require corner-cutoff if the site is located onto an existing road (i.e. Construction of a new road is not necessary). This paper reveals the historic reason of this double standard. Before World War II, the corner-cutoff rule for new roads was included in the building line guideline set by the central government, and the corner-cutoff rule for existing roads was

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... cluded in the local government rules. After World War II, however, the new Building Standard Law was established, under which private citizens can apply for a road construction to the government, and two old corner-cutoff rules were abolished. In 1970, when the new road standards were established, the details about corner-cutoff for newly constructed roads was stipulated, but those about existing roads were left untouched. Then this paper studies following three thoughts on how to resolve this double standard: 1) the corner-cutoff rule should be regulated for all road, 2) necessity to unify regulatory criteria, 3) the exclusion of the corner-cut off rule is also necessary.