[DManA]

I suppose you could argue that if you like to argue but that's not the argument was made when they were built.

Arguably, the interstate highway system is the culmination of the "post road" edict.

They were built for defense, not to speed the mail.

[Olog-hai]

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They were built for defense, not to speed the mail

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Yes, I've heard that excuse before. Kinda doesn't hold up in the face of the fact that Germany's Autobahn system ended up being a liability instead of an asset, what with the Allies using them to penetrate the Fatherland far easier than without.

The current use of the interstates for transporting mail does mark them as post roads. They along with the airlines killed the railway post office system.