What type of roller includes both three wheel and tandem options?

Steel wheeled rollers are designed with both three-wheel and tandem configurations, making them versatile in various compaction applications. These rollers typically use heavy steel drums to provide high compaction density, which is beneficial for creating a smooth surface during road construction and maintenance.

The three-wheel design often features a central steel drum with two additional wheels on either side, allowing for better maneuverability and compaction in tighter spaces. In contrast, tandem rollers are equipped with two steel drums, one at the front and another at the rear, which facilitates uniform compaction over wide areas.

This dual capability of having both three-wheel and tandem options distinguishes steel wheeled rollers from other types. Vibratory rollers primarily utilize vibrating steel drums to enhance compaction but do not inherently offer the three-wheel option. Pneumatic-tired rollers use inflated tires and, while they provide flexibility, they don't include the same drum configurations. Self-propelled rollers refer to the general capability of rollers to move independently but do not specifically indicate a type that includes both configurations. Thus, steel wheeled rollers are correctly identified for incorporating both design options.