Human Factors Limitations in Fork-Lift Truck Performance

The interaction of driving speed, steering difficulty and lateral tolerance with particular reference to agriculture

“…A reanalysis of Drury's (1974) data to test equation (5) indicated that the proposed linear relationship could be a valid predictor (r>0.99; p ~0 0 1 ) of speed. A reevaluation of some unpublished car driving data (Williams 1969) also supported the proposed model.…”

“…A similar relationship to that ofequation (2) can be derived from a model which was tested for forklift truck driving (Drury and Dawson 1974). The rearranged model can be expressed as:…”

“…Drury's model was derived from some earlier laboratory studies (Drury 1971). However, the expected linear relationship between speed and tolerance during the practical driving experiment was not obtained (Drury 1974). In particular, a marked levelling off of speed at the larger tolerance widths were found.…”

Workspace Clearance and Access Dimensions and Design Guidelines

“…Drury and Dawson (1974) found that in a fork-lift-truck driving task, as the course width increased the speed increased and errors decreased. However, beyond about 500 mm of clearance, speed started to level out and the errors decreased to zero (Fig.…”

“…Speeds and errors as a function of lateral space clearance in forklift-truck driving(Drury and Dawson, 1974).…”