HAMM ‒ operating concept. The Easy Drive operating concept, a totally new development, enables the driver to quickly become familiar with the safe and relaxed control of his roller. In addition, the Easy Drive concept sees the introduction of a uniform, innovative operating system and ergonomics throughout the range of earthworks and asphalt rollers. The user interfaces, each with arm and steering console, are thus identical on every roller type. Logically structured operating functions ensure rapid, stress-free orientation in the intuitively understandable driver’s cab. The steering wheel control is a fruit of our ergonomic research.