The manual was updated in 1960 with the same analytical methodology but with new unit cost data (American Association of State Highway Officials, 1960). A major update of the manual was issued in 1977 after a number of research efforts had been completed on analytical techniques and unit cost data (American Association of State Highway and Transportation Officials, 1978).

The manual was updated in 1960 with the same analytical methodology but with new unit cost data (American Association of State Highway Officials, 1960).
①1960年、マニュアルは、分析手法（自体）は同じだったが、新たな単位費用のデータを用いて改訂された。 (American Association of State Highway Officials, 1960)

A major update of the manual was issued in 1977 after a number of research efforts had been completed on analytical techniques and unit cost data (American Association of State Highway and Transportation Officials, 1978).
②分析手法と単位費用のデータに関する数多くの研究を経て、1977年にマニュアルの大幅な改訂が行われた。(American Association of State Highway and Transportation Officials, 1978)

The manual also was expanded to address bus transit improvements. The manual recognized that benefit-cost analysis was only an element in the evaluation of transportation projects, and that it fit within the larger urban transportation planning process.

The manual also was expanded to address bus transit improvements.
③そのマニュアルは、バスの運行改善にも対応するように拡充された。

The manual recognized that benefit-cost analysis was only an element in the evaluation of transportation projects, and that it fit within the larger urban transportation planning process.
④マニュアルは、費用効果分析が交通計画の評価における一要素にすぎず、より包括的な都市交通計画プロセスの中に位置付けられるものであると認識した。