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Effects of Time-Gap Settings of Adaptive Cruise Control (ACC)



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Safety Science 47 2009 620 625 Contents lists available at ScienceDirect Safety Science journal homepage www elsevier com locate ssci Effects of time gap settings of adaptive cruise control ACC on driving performance and subjective acceptance in a bus driving simulator Tsang Wei Lin a Sheue Ling Hwang a Paul A Green b a b Department of Industrial Engineering and Engineering Management National Tsing Hua University 101 Guangfu Road Section 2 Hsinchu 300 Taiwan University of Michigan Transportation Research Institute Human Factors Division 2901 Baxter Road Ann Arbor MI 48109 2150 USA a r t i c l e i n f o Article history Received 24 January 2007 Received in revised form 7 August 2008 Accepted 7 August 2008 Keywords Adaptive cruise control ACC Time gap settings Safety Bus a b s t r a c t A study was conducted to investigate the effects of time gap settings and contents of secondary tasks on a fix based bus driving simulator on drivers performance while reclaiming control from ACC in a car following scenario of emergency brake by the lead vehicle Thirty professional bus drivers drove on the simulator with the scenario of highway traffic flow under 12 random time gap settings from 0 64 s to 2 40 s with the interval of 0 16 s As for the effects of secondary tasks subjects were evenly divided into three conditions no secondary task interference simple secondary task and complex task The results demonstrated that different safety demarcations of time gaps on subjective acceptance and driving performance can be found out The integrated demarcations separated time gaps into divisions that represented different levels of danger It revealed that the safer time gaps for different situations were longer than 1 60 s for none secondary task distraction and longer than 2 08 s for being continuously distracted by secondary tasks The demand for simple tasks is relatively high so a larger time gap is needed for the driver to remain safe This research has implications for the time gap



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