New and further developed special surfaces and coatings in the road construction industry require more sensitive compaction. HAMM is again the first to respond to the evolving and stricter requirements. By 1983 the company was already carrying out the first field tests of the revolutionary new oscillation method of compacting. Unlike normal vibratory rolling, which compacts the material by vertical vibrations, the oscillating method keeps the compacting drum in permanent contact with the ground. The transmission of horizontal rather than vertical forces into the ground yields much better compaction results and is at the same time less stressful on the operator, material and the environment.