In 100 vehicles, 67 conventional seats and 33 suspension seats were tested to determine the benefits that might be obtained by changing seats in the vehicles. Acceleration was measured on the floor and on the seat of 14 categories of vehicles (cars, vans, lift trucks, lorries, tractors, buses, dumpers, excavators, helicopters, armoured vehicles, mobile cranes, grass rollers, mowers and milk floats). Seat Transmissibilities and SEAT values were determined for all seats. This report and the work it describes were funded by the Health and safety Executive (HSE). Its contents, including any opinions and/or conclusions expressed, are those of the authors alone and do not necessarily reflect HSE policy