Much of the work was done by hand, with the aid of tabulating machines for some of the calculations.
⑦一部を作表加算機(パンチ カード システム機)で計算しながら、ほとんどの作業は手作業で行われた。
Benefit-cost ratios were used to evaluate the major elements of the expressway network (Detroit Metropolitan Area Traffic Study, 1955-1956; Silver and Stowers, 1964; Creighton, 1970).
⑧費用-便益比は、高速道路網の重要な要素(項目)を評価するために使われた(Detroit Metropolitan Area Traffic Study, 1955-1956; Silver and Stowers, 1964; Creighton, 1970)。