The first attempt to meld many of these elements into an urban transportation planning process was in the Cleveland Regional Area Traffic Study in 1927, which was sponsored by the U.S. Bureau of Public Roads. But even in this study, traffic forecasting was a crude art using basically linear projections (Cron, 1975b).

The first attempt to meld many of these elements into an urban transportation planning process was in the Cleveland Regional Area Traffic Study in 1927, which was sponsored by the U.S. Bureau of Public Roads.
③これらの多くの項目を都市交通計画に取り込んだ最初の試みは、1927年のクリーブランド地域交通調査であり、道路局(BPR)によって支援された。

But even in this study, traffic forecasting was a crude art using basically linear projections (Cron, 1975b).
④しかし、この調査でさえ、交通需要予測は基本的に線形モデルを用いた精度の低いものにすぎなかった。(Cron, 1975b)

In the Boston Transportation Study, a rudimentary form of the gravity model was applied to forecast traffic in 1926, but the technique was not used in other areas. In fact, the 1930s saw little advancement in the techniques of urban transportation planning. It was during this period that the methodology of highway needs and financial studies was developed and expanded (U.S. Dept. of Transportation, 1979a).

In the Boston Transportation Study, a rudimentary form of the gravity model was applied to forecast traffic in 1926, but the technique was not used in other areas.
①1926年、ボストン交通調査で、交通需要予測に基本的な重力モデルを用いたが、その手法は他の地域では使われなかった。

In fact, the 1930s saw little advancement in the techniques of urban transportation planning.
②実際、1930年代での都市交通計画の手法は、あまり進歩がなかった。

It was during this period that the methodology of highway needs and financial studies was developed and expanded (U.S. Dept. of Transportation, 1979a).
③この時期に、道路需要や財政分析の方法論が開発、発展された。(U.S. Dept. of Transportation, 1979a).