Interstate and Defense Highway

Japanese: インターステート･ハイウェー（英語表記）Interstate and Defense Highway

The world's largest highway network. The first plan was announced by Congress in 1944 as a foundation to support the economy, society, culture, and national defense of the United States, and currently about 65,000 km has been completed, with less than 1% of the entire plan remaining. It connects the capitals of 43 states, connects about 90% of cities with populations of over 50,000, and handles more than 20% of all traffic, despite only being just over 1% of the total road length. What helped make this possible was the Highway Trust Fund system, which was started in 1956 and uses revenues from federal taxes such as gasoline taxes for road construction, and 90% of the construction costs are paid out as subsidies to the states from this fund.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

世界最大の高速道路網。アメリカ合衆国の経済，社会，文化，国防を支える基盤として，1944年に最初の計画が議会で発表され，現在約6万5000kmが完成し，全計画の1％以下を残すのみとなった。43州の州都を結び，人口5万以上の都市の約9割を連絡し，全道路延長の1％強にすぎないにもかかわらず，全交通量の二十数％強を分担している。その実現を助けたのは56年に始められた，ガソリン税等の連邦税の収入を道路整備にあてる〈道路信託基金〉制度で，建設費の9割がこの基金から州に対する補助として支出されている。

出典　株式会社平凡社世界大百科事典第２版について　情報

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