Heavy Vehicle Driver Workload Assessment: Task 6: Baseline Data Study

Abstract

This report consists of an empirical establishment of heavy vehicle driver baseline performance data. 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 (30) 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.

The Effects of Voice Technology on Test Track Driving Performance: Implications for Driver Distraction

“…The main effect of Secondary Task, F(3,27) = 3.09, p = ,044, reflected significantly higher modulus values for the Secondary Task = none condition (M= 1.01, SD = 0.17), relative to the three conditions involving secondary tasks Proceedings of the Human Factors andErgonomics Society 46th Annual Meeting --2002 PROCEEDINGS of the HUMAN FACTORS AND ERGONOMICS SOCIETY 46th ANNUAL MEETING --2002 Steering Reversals and Holds. A steering reversal was defined to begin when the steering velocity left a zero-velocity dead band and ended when the steering velocity entered a zero-velocity dead band such that the magnitude of the reversal was 2 degrees or greater (Tijerina, Kiger, Rockwell & Tornow, 1995). Reversal rates (reversalsh) were higher for trials involving secondary tasks, relative to the baseline condition, F(3,57) = 8.39, p < .0001.…”

Social Marketing Strategies for Stigmatized Target Populations: A Case Example for Problem Gamblers and Family Members of Problem Gamblers

“…The second half of these focus groups involved the evaluation of simulated outdoor advertisements. Since the typical person generally only looks at a print advertisement for between one to two seconds (Franzen, 1994) and the maximum glance time of a motor vehicle operator for any driving task is typically no more than three seconds (Tijerina, Kiger, Rockwell, Tomow, Kinateder, & Kokkotos, 1995), participants were initially shown each slide for only three seconds and then asked to rate on a scale of 1 to 7 how "eye-catching it was." After their rating, they were shown the same slide again for as long as they needed to rate how much they "liked the ad" on a scale of 1 to 7, and to write down an explanation for their rating.…”