Hamm’s HD+ 90 VV-S roller offers front and rear compaction, with the ability to use one drum or the other or both simultaneously. The machine sports a tight turning radius, making it easy to work on curves without any tearing or shoving. Climbing ability also is improved thanks to the hydrostatic all-wheel-drive option. A crab steering configuration provides increased working width. Operators also can switch the amplitude of compaction from large to small.