The purpose of this report was to grasp the features and characteristics of the structure of the through-passage and the proposed public contribution, which had not been paid attention to until now. The following were clarified.
1) Width and length were not related. The floor area was related to the site area and building area.
2) Many of the outdoor through passages were intended to assist traffic.
3) Eight structural patterns and characteristics of types, connecting floors, and installation locations were clarified.
4) Public open spaces with the same function as through-passages were often set up adjacent to through-passages.
