It has been made clear that the street became narrower and narrower each time buildings along the street were rebuilt, until it reached its current width, as a result of excavation researches within the precinct of Kyoto Prefectural Head Office.
京都府庁敷地内での発掘調査により、沿道の建物が建て替えられるたびに道幅が狭められ、現在のような狭い道となった過程が明らかになった。