This system was introduced to conform to the one used in the one-man city trams, but subsequently it was changed in the first half of the 1970s to the one in which you get on from the rear-side door and pay the fare later, because such a system had been used in all the private company-operated buses running in Kyoto City.
これは市電のワンマンカーと方式を合わせたためであるが、京都市内を走る民間バスがいずれも後ろ乗り後払い方式を採用したため、1970年代前半に切り替えられた。