However, as the effects of the above restrictions on the company's operation became serious with the increased numbers of passengers and bus routes, the company continued negotiations with Kyoto City; finally, in 1972, a long-awaited open door system was realized when the company concluded an agreement with the City Transportation Bureau concerning the abolishment of the closed-door system.
その後、旅客数の増加や路線の拡充延長が進むにつれて、この制約が運営面に及ぼす影響は一層強まり、完全なオープンド・ドア制の確立を目指して京都市と交渉を続けた結果、1972年に市交通局との間に待望のクローズド・ドア制撤廃に関する覚書を交換する運びとなり、永年の懸念であったオープンド・ドア制への移行がようやく実現した。