The acceptability of DIM technology will depend, to a large extent, on the degree of accuracy associated with any given system. Perceptions of system accuracy will critically influence the degree of cooperation and trust imbued by the system. In order for a DIM system to be effective, it must be accurate. The accuracy of vehicle-based indicators of fatigue may be expressed in terms of the strength of association between these indicators and psychological fatigue. A sensitive indicator is capable of accurately detecting a fatigue "signal" against the background "noise" of driving behavior. A reliable indicator is capable of consistent association with measures of psychological fatigue within a designated time frame. The field study demonstrated the independence of both qualities within a test group of steering-based indicators of fatigue. It is concluded that candidate indicators of fatigue detection must fulfil both criteria in order to function within an acceptable DIM system.
This research was funded by the CEC under the DRIVE Program in the DETER project (V2009). The author would like to acknowledge the contributions of Stephen Hirst and John Richardson during the planning, running, and analysis stages of the study; those members of the Leicestershire Constabulary who acted as subjects and their superior officer, Chief Inspector G. Compton for his help; and also the assistance of David Rogers, who acted as co-driver for the experiment.
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