National Scenic Byways have both similar and diverse traits. Similarities include common intrinsic qualities, completed corridor management plans, and substantial efforts toward program goals of preserving and promoting their intrinsic qualities. Variations include corridor characteristics, land management and ownership patterns, and the maturity and capacity of byway organizations. Despite differences, most National Scenic Byways achieve a high degree of productivity as measured by planning activity, program development, and facility improvements. It is argued that the degree of diversity accommodated in the national program is a contributing factor to byway success.