Relationships were found between color and sincerity, excitement, competence, sophistication, and ruggedness. It was used primarily in SUVs because of its large displacement, smoothness, ruggedness and torque. It had the additional advantage of ruggedness and simplicity. Its design emphasises ruggedness and ease of use. It had an unprecedented balance of firepower, mobility, protection and ruggedness. Generally these are designed for economy, ruggedness, and ease of transport rather than aesthetic qualities. Different versions of each were designed for enhanced ruggedness, low microphonics, stability, lifespan, etc. It has always been well regarded for its all-terrain abilities and ruggedness. These two species' characteristics vary in morphology and ruggedness. Appalachian frontiersmen have long been romanticized for their ruggedness and self-sufficiency. The combination of a metal structure and simple systems led to their reputation for ruggedness. In contrast, Allied fighters were designed with ruggedness and pilot protection in mind. The region is known for its ruggedness and scenic beauty. Thus, touring bikes trade speed for utility and ruggedness. Pilots praised the aircraft for Republic's legendary ruggedness.