Abstract:
OBJECTIVE:The current study investigated driver vigilance in partially automated vehicles to determine whether increased task demands reduce a driver's ability to monitor for automation failures and whether the vigilance decrement associated with hazard detections is due to driver overload. BACKGROUND:Drivers of partially automated vehicles are expected to monitor for signs of automation failure. Previous research has shown that a driver's ability to perform this duty declines over time. One possible explanation for this vigilance decrement is that the extreme demands of vigilance causes overload and leads to depletion of limited attentional resources required for vigilance. METHOD:Participants completed a 40-min drive in a simulated partially automated vehicle and were tasked with monitoring for hazards that represented potential automation failures. Two factors were manipulated to test the impact of monitoring demands on performance: Spatial uncertainty and event rate. RESULTS:As predicted, hazard detection performance was poorer when monitoring demands were increased, and performance declined as a function of time on task. Subjective reports also indicated high workload and task-induced stress. CONCLUSION:Drivers of partially automated vehicles are impaired by the vigilance decrement and elevated task demands, meaning that safe operation becomes less likely when the demands associated with monitoring automation increase and as a drive extends in duration. This study also supports the notion that vigilance performance in partially automated vehicles is likely due to driver overload. APPLICATION:Developers of automation technologies should consider countermeasures that attenuate a driver's cognitive load when tasked with monitoring automation.
journal_name
Hum Factorsjournal_title
Human factorsauthors
Greenlee ET,DeLucia PR,Newton DCdoi
10.1177/0018720818802095subject
Has Abstractpub_date
2019-05-01 00:00:00pages
474-487issue
3eissn
0018-7208issn
1547-8181journal_volume
61pub_type
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