During this period, the BPR sponsored a study, which was conducted by Robert Mitchell and Chester Rapkin, on traffic generation at Columbia University. The study was directed at improving the understanding of the relationship between travel and land use through empirical methods, and it included both persons and goods movement.

During this period, the BPR sponsored a study, which was conducted by Robert Mitchell and Chester Rapkin, on traffic generation at Columbia University.
①この期間、道路局（BPR）は、ロバート・ミッチェルとチェスター・ラプキンによってコロンビア大学で実施された交通生成に関する研究を支援した。
　　※traffic generation：専門用語、交通生成で、traffic production (発生)、traffic attraction (集中)で構成される。

The study was directed at improving the understanding of the relationship between travel and land use through empirical methods, and it included both persons and goods movement.
②この研究は、実証的手法を用いて、交通と土地利用の関係についての理解を深めることを目的とし、人や物資の両方の移動(交通)の対象としていた。
　　※inckuded: 「含んでいた」方もいいが、「対象としていた」方がより意味の通る自然な日本語。

Mitchell and Rapkin (1954) state as a major premise of their study: Despite the considerable amount of attention given in various countries to movement between place of residence and place of work, the subject has not been given the special emphasis suggested here; That is, to view trips between home and workplace as a "system of movement," changes in which may be related to land use change and to other changes in related systems of urban action or in the social structure. (p. 65)

Mitchell and Rapkin (1954) state as a major premise of their study:
③ミッチェルとラプキン（1954年）は、彼らの研究の主な前提として次のように述べている。

Despite the considerable amount of attention given in various countries to movement between place of residence and place of work, the subject has not been given the special emphasis suggested here;
④居住地と勤務地との間の移動については、各国で相当な注目が集まってきたにもかかわらず、この主題には、ここ（この研究）で示すような特別な重視はされていなかった。

That is, to view trips between home and workplace as a "system of movement," changes in which may be related to land use change and to other changes in related systems of urban action or in the social structure. (p. 65)
⑤つまり、自宅から職場へのトリップを「移動のシステム」として捉えることは、そのシステムの変化が、土地利用の変化や、都市活動の関連システム、あるいは社会構造の変化と関係している可能性がある。（p.65）