Read your Constitution. The Federal gov’t does have an enumerated power to establish post roads.
Enumerated power does not mean EXCLUSIVE power. It merely mentions that they can build post roads....nothing more.
You agreed that the Federal gov’t has “no role” in transportation. I showed that there is a specific enumerated power to establish roads that argues otherwise.
I don’t argue that this power is exclusive.
But if “the Tea Party” argues that there is “no role” for the Federal gov’t in transportation, then “the Tea Party” is ignorant.