This on-road field investigation employed, for the first time, a completely automated, trigger-based data collection system capable of evaluating driver performance in an extended duration real-world motor vehicle environment. The portion of the study reported herein examined the use of self-assessment of fatigue (Karolinska Sleep Scale) as an indicator of driver fatigue. Without exception, the regression analyses for the self-assessment of fatigue yielded models low in predictive ability and were not found to be a suitable indicator of driver fatigue in a real-world commercial driving environment. Various reasons for the failure of self-rating of fatigue as a valid measure are discussed.
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