Roundabout Entry Capacity Estimation under the Condition of Autonomous Vehicle Mixed Traffic Flows

In recent years, increasing number of roundabouts has been implemented in Japan due to their good performance on both safety and efficiency. To evaluate the roundabout operational performance, entry capacity is one of the most important indices. With the development of vehicular technologies, the appearance of autonomous vehicles (AV) will lead to a mixed flow condition which can cause significant impact on roundabout entry capacity. Thus, this paper aims to examine the influence of AVs on the entry capacity through applying a microscopic traffic simulation. Moreover, in order to clearly classify the impacts of AVs, different aggressive levels and the percentage of AVs involved in flows are considered in this paper. The main findings indicated that aggressive AV can increase entry capacity since shorter gap parameters are defined. Additionally, AVs in entry flow performed greater impact on entry capacity than the condition AVs in circulating flow. Then, based on the findings, an adjustment factor f AV is developed to simplify the estimation process. Through comparing MAPE, it can be concluded that entry capacity under the condition AV mixed flow can be well adjusted by f AV .


  • English

Media Info

  • Media Type: Web
  • Features: Figures; References; Tables;
  • Pagination: 14p

Subject/Index Terms

Filing Info

  • Accession Number: 01764020
  • Record Type: Publication
  • Report/Paper Numbers: TRBAM-21-02165
  • Files: TRIS, TRB, ATRI
  • Created Date: Dec 23 2020 11:17AM