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）は同じだったが新しい単位費用のデータを用いて、更新された。 (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多くの研究によって、1977年にマニュアルの主要な更新が行われた。(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への取り込みまで拡大した。

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マニュアルでは、費用効果分析は交通計画における評価要素の一つにすぎず、更に大規模の都市交通計画プロセスに適すると認識した。