Recommended Exit Sign Information Loads within Roundabouts

This paper applied an operational field study and an analytical process to recommend roundabout exit sign loading conditions, i.e., the number of destination names or route numbers. The available time for drivers to detect and read roundabout exit signing is affected by both exit sign placement and various operational conditions, e.g., merge and lane-change requirements. It was therefore necessary to develop sign information load requirements in the context of competing roundabout driving task demands, e.g., merging, lane changing, and exiting. Field study results indicated that operational speeds closely correlated to the R4 radius design speed, as documented in the Federal Highway Administration’s Roundabouts: An Informational Guide. Sign information lead time, i.e., that available for detecting and reading a sign, was determined from the operational speed and detection distance to a roundabout exit sign. The required time to read sign components, e.g., words and numbers, and to make the appropriate choice decisions was derived the literature. Available sign reading and decision time in roundabouts was then based on the difference between total sign information lead time and the time consumed by the competing tasks. Roundabout sign loading conditions, e.g., number of words, were then determined on the basis of information load that could be processed in the available time.


  • English

Media Info

  • Media Type: Print
  • Features: CD-ROM; Figures; References; Tables;
  • Pagination: 11p
  • Monograph Title: ITE 2005 Annual Meeting and Exhibit Compendium of Technical Papers

Subject/Index Terms

Filing Info

  • Accession Number: 01006870
  • Record Type: Publication
  • ISBN: 1933452080
  • Files: TRIS, ATRI
  • Created Date: Oct 20 2005 7:01PM