road narrower than 4m that qualifies as a connecting road for building permission
Legal term under the Building Standards Act. Even if the road is under 4 meters wide, it is treated as a valid frontage road for determining whether construction is allowed on an adjacent plot, provided certain conditions are met. Often referenced in real estate and architectural contexts.
See also: 接道義務
Because this plot faces a 二項道路, it may be possible to obtain building confirmation.
When a road is designated as a 二項道路, a setback may be required when rebuilding.