Why no Interstate I-30, I-50 and I-60?

[Suburban_Plankton]

@septimus

IIRC, if you stay on California’s I-280 South it eventually changes name to I-680 North.

And at one point in the East Bay, you can drive on I-80 East and I-580 West at the same time.

[Powers]

@cmkeller

Good point. While obviously an interstate highway can’t be expected to go all the way to the shoreline, I’d think that to qualify as a true E-W cross-country route, it should end somewhere in a city or town on the Atlantic or Pacific coast.

Given the desire for Interstates to end at other Interstates, I should think ending in a coastal state would be sufficient. Or within 100 miles of the coast.
Powers &8^]