Has anyone ever asked you that question: Why does Hawaii have interstates? I know that I like to ask it every now and again. Its ironic and seemingly a non sequitur right? After all the name interstate implies that it links two or more states.
Guess what? There is a website (I think it's setup by Hawaii DOT) that explains this quandry. Why or how I find these things, please don't ask.
Apparently the Hawaii interstate system springs from the need to move military personnel and materiel around the many installations on Oahu. They built a fourth one for the increased needs of the Vietnam War, but it wasn't finished until more than 20 years after. LOL