superroad

noun
su·​per·​road | \ ˌsü-pər-ˈrōd How to pronounce superroad (audio) \
plural superroads

Definition of superroad

: a very large road … surveys were started in the 1930s in Indiana for a superroad known as the Tri-State Highway, a tax-financed facility with design standards on a par with toll roads.— Albert J. Wedeking

First Known Use of superroad

1907, in the meaning defined above

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The first known use of superroad was in 1907

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