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The word "road contact failure" means a building site failing to satisfy the road contact requirement according to the Building Standards Law. According to the Building Standards Law, when a housing site does not have, a length of the site facing a road of 2 m or more with a road with a width of 4 m or more, a building cannot be constructed in the site. Many effected sites have this problem, as well as small sites, which is making rebuilding difficult.
6. Road contact failure (alley)
Types of road contact failure:
There are several types of road contact failure. The Shigaichi Kenchikubutsu Ho (enforced in 1934) prescribed that a building site should be in contact with a road with a width of 9 shaku (approximately 2.7 m) or more. Before the Building Standards Law was enacted, houses were built on sites facing roads with a width of 2.7 m. Also, some row houses were built on private alleys within a block. Thereafter, each unit was sold separately. This resulted in building sites facing the alley, that is, the private road. A house to be rebuilt in such a site has the problem of the road contact failure when the facing alley does not have a width of 4 m or more.
Also, fragmentation of a housing site results in producing a front lot facing a road and a back lot. An approach is constructed from the road to the back lot, but the approach generally has a width of less than 2 m. Such a back lot having the approach to the road with a width of less than 2 m also has the problem of the road contact failure.
In this manner, over a long period of urbanization, the owners of housing sites have changed and housing sites have been fragmented, resulting in housing sites with road contact failure.
Road under Sub-section 2:
As a remedy for this problem, a narrow road having a width of less than 4 m but satisfying predetermined requirements (for example, a width of 1.8 m or more) is designated as a road according to Sub-section 2 of Section 43 of the Building Standards Act. The designated road is positioned as a "road" according to the Building Standards Act. In a housing site facing a road under Sub-section 2, a building can be constructed by locating its front wall 2 m away from the center of the road. In other words, even when the facing road has a width of merely 3 m, a building can be constructed by assuming that a front part with a depth of 50 cm of the site facing the road serves as the road.
On a small housing site, however, when the building is set back from the center of the road by 2 m, the area of the site becomes even smaller, and it can become difficult to built a house there. As a result, illegal buildings have been constructed.
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