Many Interstates, such as circumferentials/beltways and spurs, are confined to one State. Although Hawaii's Interstate highways are not connected to those in the continental United States, they are built to Interstate standards. ... Puerto Rico's three Interstate highways total 250 miles.
I know it's a standard, but as they are still named Interstates, it doesn't make that much sense in the sense.
The link is pretty good. Doesn't make much sense to me to call them that but what do we know?
Well, that miniseries I referred to earlier had an Intergalactic Radio with a weird Rubik's cube attached to it. And the other main character's imaginary brother told him to solve it, before it was too late, so... Compared to a lot of the fiction, reality is even weirder.
Something about unintuitive technical meanings
That's the only way they could get the federal funds to build the roads.
I misread at first, as funeral fundings, but... I guess it is the same these days.
Because it's used by the US Postal Service ... which is an "interstate commerce" transport. Yeah. That's it.