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Abstract
The handling and steering of an in-service wheeled vehicle were investigated, following a number of adverse reports. This paper presents the subjective assessments of the vehicle's power steering, which were included in that investigation.
The effects of three different power steering settings were appraised by driving the vehicles on a road-test track and cross-country. In addition, two questionnaires enabled the drivers' overall views and comments on specific factors to be recorded. Analysis of variance showed that the subjectively assessed differences between the three vehicle power steering settings were statistically significant at the 2 per cent level. The six civilian and six military drivers' views were congruent and course differences (road or cross-country) did not consistently and significantly affect the overall assessment. The drivers' stated preferences among the vehicles supported the analysis of variance results.
Incidents observed during the trials showed that drivers could lose control of the vehicle because of excessive speed and/or faulty driving technique, independently of power steering characteristics. This suggests that many incidents could be prevented by giving specific instructional guidelines to drivers during training and by the incorporation of a speed limiting device in any modifications to the vehicle tested.