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V. J. Pezoldt

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Publications by V. J. Pezoldt (bibliography)

1992

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Brackett, R. Quinn, Pezoldt, V. J. and Roush, Laura (1992): Estimating the Height of a Suspended Wire. In: Proceedings of the Human Factors Society 36th Annual Meeting 1992. pp. 955-959.

“Estimating the height of a wire above the ground is a task that may be required to avoid contacting electrical distribution lines with ladders, antennae, long poles, or other reach extending devices. It has been suggested that this task is difficult because wire is often presented against the homogeneous field of the sky. The accuracy of estimations under this condition may be poor when made on an absolute basis, that is using an internal frame of reference. However, accuracy should improve when the estimation is made on a relative basis, using some external frame of reference. In order to assess the accuracy of such estimations, forty subjects were each asked to give a verbal estimate of the height of a suspended wire, as well as to match the wire height using a horizontal reference pole and a vertical reference pole. As expected, the verbal, or absolute, estimates had a higher average percent error (17.1%) than the relative horizontal estimates (7.7%). Relative vertical estimates produced the most accurate values, within about 2.0% of the actual wire height. The degree of accuracy observed in subjects using external references suggests that the ability to avoid contact with overhead electrical distribution lines may be high, given appropriate knowledge, attention, and motivation.”

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Roush, Laura, Pezoldt, V. J. and Brackett, R. Quinn (1992): Initial Driver Foot Placement as an Antecedent to Pedal Error. In: Proceedings of the Human Factors Society 36th Annual Meeting 1992. pp. 970-974.

“Two observational studies were conducted to examine driver foot pedal operation characteristics which may influence pedal activation errors. Driver behaviors were observed during controlled closed-course and natural driving situations to document individual pedal operating characteristics. A substantial portion of the drivers in both studies shifted from park to forward and/or reverse gears without positioning a foot over or on the brake pedal. A small percentage of drivers used both feet for pedal activation. The results of these studies suggest that pedal design and layout should take these behaviors into consideration. Either method would likely be less accurate and potentially more hazardous than when the right foot is directly over the brake pedal, and suggests the efficacy of a mechanical interlock to prevent gear selection from park to either forward or reverse gears until contact with the brake pedal is made.”

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