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. Author manuscript; available in PMC: 2015 Sep 8.
Published in final edited form as: Hum Factors. 2013 Feb;55(1):6–35. doi: 10.1177/0018720812465640

Figure 1.

Figure 1

The number of participants who kept roll-over protective structures (ROPS) erected (triangles) or did not have ROPS on their tractors (squares) were both evenly divided (50% vs. 50%) at the mean sitting height (91.8 mm), while 83.3% of the individuals who folded away the ROPS (circles/solid dots) had a sitting height greater than 91.8 cm. Eleven out of 12 (91.7%) of those participants who folded away the ROPS (circles/solid dots) have a sitting height greater than the clearance specification (90 cm) of current SAE J2194 standard for ROPS. Shoulder width did not have an association with the decision of folding away a ROPS.