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Today in Interstate History

A section of Interstate Highway in Honolulu, Hawaii.

August 29, 1960

Federal Highway Administrator Bertram D. Tallamy approved three routes – H-1, H-2, and H-3 – on the Island of Oahu in Hawaii. Those designations took place just a little over a week after Hawaii officially became the 50th state, and also signified a geographical milestone for the Interstate System. That is because each of those routes, despite not being physically linked to the Interstate System on the mainland, would be constructed to the full standards of that highway network. That action was made possible by Section 17 of the Hawaii Omnibus Act, which repealed the provision confining designation of the Interstate System to the continental United States.