The San Juan, Puerto Rico, transportation study, begun in 1948, was one of the earliest to use a trip generation approach to forecast trips. Trip generation rates were developed for a series of land-use categories stratified by general location, crude intensity measures, and type of activity. These rates were applied, with some modifications, to the projected land use plan (Silver and Stowers, 1964). 

The San Juan, Puerto Rico, transportation study, begun in 1948, was one of the earliest to use a trip generation approach to forecast trips.
①1948年に始まったSan Juan, Puerto Ricoの交通調査は、交通量を予測するために、生成(発生集中)交通法を最も早く用いた一つであった。

Trip generation rates were developed for a series of land-use categories stratified by general location, crude intensity measures, and type of activity.
②トリップ生成原単位は、全体的な立地や疎密度、アクティビティのタイプによって階層化された(一連の)土地利用区分のために開発された。

These rates were applied, with some modifications, to the projected land use plan (Silver and Stowers, 1964).
③少し修正されたこれらの原単位は、（計画された）土地利用計画に適用された。

The Detroit Metropolitan Area Traffic Study (DMATS) put together all of the elements of an urban transportation study for the first time. It was conducted from 1953 to 1955 under Executive Director Dr. J. Douglas Carroll Jr. The DMATS staff developed trip generation rates by land use category for each zone. Future trips were estimated from a land use forecast.

The Detroit Metropolitan Area Traffic Study (DMATS) put together all of the elements of an urban transportation study for the first time.
①デトロイト・メトロポリタン地区交通調査（DMATS）は、初めて、都市交通調査の全ての要素(項目)で構成された。

It was conducted from 1953 to 1955 under Executive Director Dr. J. Douglas Carroll Jr.
②そして、それは事務局長 J. Douglas Carroll Jr.の下で、1953年から1955年まで実施された。

The DMATS staff developed trip generation rates by land use category for each zone.
③DMATASのスタッフは、それぞれの区域ごとに土地利用区分を利用して、トリップ生成原単位を作った。

Future trips were estimated from a land use forecast.
④将来の交通量は、土地利用予測から推定された。