United States Department of Transportation
i
Heavy vehicle driver workload assessment. Task 6, baseline data study
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1996-10-01
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[PDF-1.27 MB]
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Edition:Final Report; July 1991-September 1995
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Abstract:This report covers the sixth in a series of tasks involving the assessment of driver workload in heavy vehicle operation associated with in-cab devices or systems. A review of the overall study was provided by Tijerina, Kantowitz, Kiger, and Rockwell (1994). This phase of the work had as its chief objective the development of a baseline of driver visual allocation, in-cab behaviors, and driver-vehicle performance under different driving conditions, driving tasks, and in-cab tasks while on the road. Researchers interested in highway safety have called out the need for rudimentary workload data so that they might have a basis for comparison of workload associated with particular in-cab high technology devices. Thirty professional drivers participated and were asked to perform a series of tasks during over-the-road drives involving both open road driving and close car following in both day and night conditions. The requested tasks included looking at right and left mirrors, adjusting CB volume, changing CB frequency, manually tuning the radio, adjusting radio volume, reading clock, reading air pressure, adjusting the heating or air conditioning, and calculating available driving hours. Drivers were measured with respect to visual allocation; steering, accelerator, and brake inputs; speed and headway maintenance; and lanekeeping. Results indicated that, to a varying degree, visual allocation measures, several steering measures, speed variance, and several lane position measures are preferable measures for further workload assessment.
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