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原文传递 Developing Highway Capacity Manual Capacity Adjustment Factors for Connected and Automated Traffic on Roundabouts

题名：	Developing Highway Capacity Manual Capacity Adjustment Factors for Connected and Automated Traffic on Roundabouts
正文语种：	eng
作者：	Jiang, Qinhua;Schroeder, Bastian;Ma, Jiaqi;Rodegerdts, Lee;Cesme, Burak;Bibeka, Apoorba;Morgan, Abby
作者单位：	Univ Calif Los Angeles Dept Civil & Environm Engn 420 Westwood Plaza 5731 Boelter Hall Los Angeles CA 90095 USA;Kittelson & Associates Inc 272 North Front St Suite 410 Wilmington NC 28401 USA;Univ Calif Los Angeles Dept Civil & Environm Engn 420 Westwood Plaza 4731 Boelter Hall Los Angeles CA 90095 USA;Kittelson & Associates Inc 851 SW 6th Ave Suite 600 Portland OR 97204 USA;Kittelson & Associates Inc 300M St SE Suite 810 Washington DC 20003 USA;Kittelson & Associates Inc 272 N Front St Suite 410 Wilmington NC 28401 USA;Kittelson & Associates Inc 200 SW 1st Ave Suite 1070 Ft Lauderdale FL 33301 USA
关键词：	Connected and automated vehicles (CAV);Highway capacity manual (HCM);Capacity adjustment factors;Microscopic simulation;Roundabout
摘要：	Connected and automated vehicles (CAVs) are expected to transform future transportation systems. Over time, these vehicles might enhance traffic efficiency and safety, especially at urban intersections. Therefore, it is essential to make adaptations to the traffic analysis models that are currently designed for human-driven vehicles only. This paper aims to assess the impact of CAVs on the entry capacity of roundabouts and develop an approach to adjust the capacity values calculated by the Highway Capacity Manual (HCM) for planning level analysis. Both single- and double-lane roundabouts are studied under various CAV market penetration rates and conflict flow rates in this paper. A specific CAV application, cooperative adaptive cruise control (CACC), is evaluated in this study because it enhances the car-following behavior at the roundabout entrance and has the best potential for improving the entry capacity. The simulation results indicate that the introduction of CAVs can substantially improve the entry capacity as the market penetration rate increases for both single- and double-lane roundabouts. The capacity improvement is more significant in the single-lane roundabout than in the double-lane roundabout. The capacities under different CAV market penetration rates and conflict flow rates are calculated and compared with the capacity results estimated from base models in the HCM to acquire the adjustment factors. Finally, a table of capacity adjustment factors is provided for the future implementation of HCM models.
出版年：	2022
期刊名称：	Journal of Transportation Engineering
卷：	148
期：	5
页码：	04022014.1-04022014.10