A national system of interstate highways of 40,000 miles was authorized. The routes were selected by the states with BPR approval, but no special funds were provided to build the system beyond regular federal-aid authorizations.

A national system of interstate highways of 40,000 miles was authorized.
①（総延長）40,000マイルの全米州間道路網（の整備）が認可された。

The routes were selected by the states with BPR approval, but no special funds were provided to build the system beyond regular federal-aid authorizations.
②路線は、道路局(BPR)の承認を得て各州が選定したものの、この道路網の整備のために、通常の連邦補助金の枠を超えた特別な財源はなかった。

EARLY URBAN TRAVEL SURVEYS

Most urban areas did not begin urban travel surveys until 1944. It was during that year the Federal-Aid Highway Act authorized the expenditure of funds on urban extensions of the federal-aid primary and secondary highway systems.

EARLY URBAN TRAVEL SURVEYS
初期の都市交通調査

Most urban areas did not begin urban travel surveys until 1944.
①多くの都市圏では、1944年（になる）まで都市交通量調査は開始されなかった。

It was during that year the Federal-Aid Highway Act authorized the expenditure of funds on urban extensions of the federal-aid primary and secondary highway systems.
②それは（ちょうど）、連邦補助道路法(FAHA)が、第1・2級道路網の都市延長区間への財源支出を認めた時期であった。