Improving the Design of Guide Signs in a Roundabout Using Perceptual Constancy

Compared with other types of intersections, a roundabout has some benefits. It can improve the highway capacity in some extent by reducing the conflict points and traffic delays at a signalized intersection. But the monotonous environment in a large roundabout offers few reference points and is prone to reduce mental rotation ability. Thus, drivers have to spend more time identifying the exit they want, which may influence the capacity of a roundabout. Therefore, discovering low-cost methods of traffic engineering that reduce this visual illusion and improve sense of direction is an important challenge for current large roundabout operations. Considering the perceptual constancy, a new guide sign system for roundabouts is put forward to solve the aforementioned problems. In order to observe how the guide signs affect the driver’s sense of direction in large roundabouts. A three-dimensional model of large roundabout was built in a driving simulator. Psychophysical tests of sense of direction were carried out. The precision of the simulation model was then checked by comparing the results to field test data. The test results reveal that the guide sign system can effectively improve the accuracy of exit identification and reduce the travel time driving through a roundabout despite the sex difference and age difference. That is beneficial to improve capacity and reduce traffic delays in a roundabout.

  • Supplemental Notes:
    • This paper was sponsored by TRB committee ANB75 Standing Committee on Roundabouts.
  • Corporate Authors:

    Transportation Research Board

  • Authors:
    • Wan, Hongliang
    • Du, Zhigang
    • Chen, Xiaohong
  • Conference:
  • Date: 2019


  • English

Media Info

  • Media Type: Digital/other
  • Features: Figures; Photos; References; Tables;
  • Pagination: 16p

Subject/Index Terms

Filing Info

  • Accession Number: 01697928
  • Record Type: Publication
  • Report/Paper Numbers: 19-01328
  • Files: TRIS, TRB, ATRI
  • Created Date: Dec 7 2018 9:42AM