Trafficway

A word that appears unique to Kansas City, used for some semi-major streets. To the best of my analysis, a trafficway appears to be a road that veers from the actual course of where the straight line street should be, e.g., 63rd Street Trafficway, 7th Street Trafficway. I have seen no other city that has a trafficway, and I think it is a very silly word. A freeway exit sign may abbreviate it as TFWY. How on earth would a visitor from another town (which interstate freeways are designed for) have a clue what that means?