The operators of site preparation equipment are subjected to high levels of whole-body vibration (W-BV) because of the prerequisite for a continuous travel work cycle and for full coverage of the area to be treated. This study defines the magnitude of these levels for a sample of machines working in various site conditions, and shows how machine and operating characteristics can influence W-BV levels. The machine sample encompasses both tracked and wheeled prime movers, with these either pulling or pushing their site preparation implement.