Six primary-task and four secondary-task workload measures were investigated in a fixed-base truck simulator. Twelve commercial drivers each drove twelve simulator modules, each 55,000 feet in length. Independent variables were road geometry, traffic density, and secondary task. All primary task measures except steering rate were not influenced by the addition of a secondary task. Two secondary tasks, reaction time to reading the vehicle tachometer and immediate recall of a 7-digit auditory number, provided effective measures of driver workload.
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