The decrease in the overall rate of machine-related deaths was 41%. While mobile machinery accounted for a larger number of deaths during the time period, the decrease in fatality rates (34%) for mobile machinery was lower than the decrease in stationary machine-related rates (64%). This substantial decrease in the rates for stationary machinerelated deaths may be due to a shifting workforce from the manufacturing of goods to the provision of services [Loomis et al., 2004; Lee and Mather, 2008; Morse et al., 2009], but may also be due to engineering modifications that make stationary machines safer (e.g., new machine designs and new protective technology) [Herbert and Landrigan, 2000; Stout and Linn, 2002]. The less substantial decrease in the rates for mobile machine-related fatalities may be due to the work environment. Industries such as agriculture/forestry/fishing, construction, and mining utilize a higher proportion of mobile machines compared to stationary machines. The safety performance of mobile machines in these work settings is more difficult to control than in assembly-line environments that may be more typical of stationary machines [Baker et al., 1992; Ringen et al., 1995]. As argued by Baker et al. [1992], “despite improvements in machinery…further design changes are needed to provide automatic protection.”