Acreage of Highways

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Just how much area do USA highways take up?

A USA highway is typically 200 feet wide (including shoulder and righ-of-way) - 76 feet in minimum width with shoulder for 2-lane highway, plus whatever land is taken until land can be used for applications other than right-of-way. Thus, there are ~24 acres covered by US highways per mile or highway length.

24 acres per mile means about 1M acres based on the length of USA Interstate Highways and USA Roads.