By the 1940s, it was apparent that if certain relationships between land use and travel could be measured, these relationships could be used as a means to project future travel. It remained for the development of the computer, with its ability to process large masses of data from these surveys, to permit estimation of these relationships between travel, land use, and other factors.

By the 1940s, it was apparent that if certain relationships between land use and travel could be measured, these relationships could be used as a means to project future travel.
①1940年代までに、土地利用と交通との関連性が正しく評価されれば、これらの関連性は将来の交通需要を予測する手段として用いられたことは、明らかであった。

It remained for the development of the computer, with its ability to process large masses of data from these surveys, to permit estimation of these relationships between travel, land use, and other factors.
②交通、土地利用、他の要因とこれらの関連性を分析するため、大量の調査データの処理能力をもつコンピュータの開発が必要とされた。

The first major test using this approach to develop future highway plans was during the early 1950s in San Juan, Puerto Rico, and in Detroit (Silver and Stowers, 1964; Detroit Metropolitan Area Traffic Study, 1955/1956).

The first major test using this approach to develop future highway plans was during the early 1950s in San Juan, Puerto Rico, and in Detroit (Silver and Stowers, 1964; Detroit Metropolitan Area Traffic Study, 1955/1956). 
③将来の道路計画の進めるために、このアプローチを用いた最初の大きな試しが、1950年代初期に、サンフアン(San Juan)、プエルトリコ(Puerto Rico)、デトロイト(Detroit)で行われた。(Silver and Stowers, 1964; Detroit Metropolitan Area Traffic Study, 1955/1956)