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Impacts of automated passenger cars on the capacity of a freeway basic section: applicability in the determination of vehicle adjustment factors in mixed traffic

Digital Transportation and Safety

引用

Digital Transportation and Safety 2023年第4期2卷 298-307页

作者： Sia M.Lyimo Valerian Kwigizile Jun-Seok Oh Zachary D.Asher Graduate Transportation Engineer Progressive AE18114 Mile Rd NEGrand RapidsMI 49525USA Civil and Construction Engineering Western Michigan UniversityKalamazooMI 49008USA Mechanical and Aerospace Engineering Western Michigan UniversityKalamazooMI 49008USA

The highway capacity manual(HCM)provides a formula to calculate the heavy vehicle adjustment factor(fHV)as a function of passenger car equivalent factors for the heavy vehicle(ET).However,a significant drawback is that the methodology was established solely based on human-driven passenger cars(HDPC)and human-driven heavy vehicles(HDHV).Due to automated passenger cars(APCs),a new adjustment factor(fAV)might be *** study simulated traffic flows at different percentages of HDHVs and APCs to investigate the impacts of HDHVs and APCs on freeway capacity by analyzing their influence on fHV and fAV *** simulation determined observed adjustment factors at different percentages of HDHVs and APCs(fobserved).The HCM formula was used to calculate(fHCM).Modifications to the HCM formula are proposed,and vehicle adjustment factors due to HDHVs and APCs were calculated(fproposed).Results showed that,in the presence of APCs,while fobserved and fHCM were statistically significantly different,fobserved and fproposed were statistically ***,this study recommends using the proposed formula when determining vehicle adjustment factors(fproposed)due to HDHVs and APCs in the traffic stream.

关键词： Connected and automated vehicles Adjustment factors passenger car equivalent factors Automated passenger cars Freeway operation

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