[DManA]

Seems to me it gives them the power, if they choose to exercise it, to establish a post office. I don’t see that it mandates them to do it.

“To establish Post Offices and post Roads;”

How many post roads are there?

[Olog-hai]

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How many post roads are there?

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Very few so named; the most famous named one in the country is the Boston Post Road (aka US 1 nowadays, which is the "lower" post road along the shore line).

Arguably, the interstate highway system is the culmination of the "post road" edict. The notion was certainly supported by the old Commission on Post Offices and Post Roads in the early half of the century. The total cost to the public for building that system comes to about half a trillion dollars, and like every federal "trust fund" meant to support such things, there's no self-sufficiency in it.