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 tha...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 expected.This 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 values.The 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 equal.Hence,this study recommends using the proposed formula when determining vehicle adjustment factors(fproposed)due to HDHVs and APCs in the traffic stream.展开更多
货车故障轨旁图像检测系统(TFDS,Trouble of moving Freight car Detection System)是保障铁路货车运行安全的重要技术装备。为适应TFDS检车作业场所集中化的管理变革,建设了TFDS集中检车系统(简称:TFDS检车平台),通过汇集多个轨旁TFDS...货车故障轨旁图像检测系统(TFDS,Trouble of moving Freight car Detection System)是保障铁路货车运行安全的重要技术装备。为适应TFDS检车作业场所集中化的管理变革,建设了TFDS集中检车系统(简称:TFDS检车平台),通过汇集多个轨旁TFDS探测站的检测数据,实现TFDS动态检车任务的统一分配和作业过程的闭环管理。随着TFDS动态检车任务量不断加重,亟需强化动态检车作业质量考核,提高检车员辨识车辆故障的能力,以确保运用货车安全运行、满足货运装车需要。本文针对TFDS检车平台在应用中存在的不足,充分利用该平台的TFDS货车图像数据,研究开发TFDS货车图像数据应用系统,满足动态检车作业质量评价、检车员培训等实际需求,有助于提升TFDS集中检车作业的质量和效率。展开更多
文摘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 expected.This 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 values.The 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 equal.Hence,this study recommends using the proposed formula when determining vehicle adjustment factors(fproposed)due to HDHVs and APCs in the traffic stream.
文摘货车故障轨旁图像检测系统(TFDS,Trouble of moving Freight car Detection System)是保障铁路货车运行安全的重要技术装备。为适应TFDS检车作业场所集中化的管理变革,建设了TFDS集中检车系统(简称:TFDS检车平台),通过汇集多个轨旁TFDS探测站的检测数据,实现TFDS动态检车任务的统一分配和作业过程的闭环管理。随着TFDS动态检车任务量不断加重,亟需强化动态检车作业质量考核,提高检车员辨识车辆故障的能力,以确保运用货车安全运行、满足货运装车需要。本文针对TFDS检车平台在应用中存在的不足,充分利用该平台的TFDS货车图像数据,研究开发TFDS货车图像数据应用系统,满足动态检车作业质量评价、检车员培训等实际需求,有助于提升TFDS集中检车作业的质量和效率。
