Danford50 wrote:
looking for the best route from NC to keystone SD if possible the best route without going through the NC mountain
"Best" is always subjective, depending on one's priorities. Based on your criteria of not going through the NC mountains, seems like you'd have to go around them. That would likely mean going south to Atlanta, then taking I-20 west to Birmingham, I-22/US 78 to Memphis, then either head up to St Louis and go across the central Great Plains, or take I-40 across Arkansas and in to Oklahoma, and then go north from whatever preferred route you may want to take -- there are multiple ways to get there.