Alaska and Puerto Rico also have Interstate roads, and there are multiple Interstates in the contiguous 48 that are entirely within a single state.
(The reason here is that the Interstate system was build under a Federal program that Eisenhower signed off on, with the goal for the roads to be designed to carry a certain amount of traffic at a certain rate of speed, between critical areas (population centers, major agrarian centers, etc.). So the "Interstate" wasn't an explicit design to connect states, although that's what a lot of it did, it was more of a standard to be applied to new roads built using funding from the Interstate Program.)
(The reason here is that the Interstate system was build under a Federal program that Eisenhower signed off on, with the goal for the roads to be designed to carry a certain amount of traffic at a certain rate of speed, between critical areas (population centers, major agrarian centers, etc.). So the "Interstate" wasn't an explicit design to connect states, although that's what a lot of it did, it was more of a standard to be applied to new roads built using funding from the Interstate Program.)
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