The objective of this project was to develop new guidance signing for traffic circles. The measure of effectiveness which seemed the most feasible for use in determinning the effectiveness of the new guidance signing was the percentage of drivers who made the preferred maneuvers. The preferred maneuvers were determined on the basis of safety and efficiency. The percentage of vehicles who made the preferred maneuvers was measured for both before and after sign change conditions and compared to determine the effectiveness of the new signing. Traffic studies were conducted at 5 circles; 3 of which were regular and 2 cut-through. Diagrammatic signs were tested at the 3 regular circles and 1 of the cut-through circles. A modified stack sign was tested at the other cut-through circle. Diagrammatic signing was found more effective than conventional signing in reducing driver confusion at regular circles. Diagrammatic signing was also found more effective than conventional signing in reducing driver confusion at cut-through circles for left and right turning movements. No advantage could be shown for modified stack signing over conventional signing. Diagrammatic signs were recommended for use at both regular and cut-through circles. Specifications and photos of the diagrammatic signs recommended are included in the report.

Media Info

  • Features: Appendices; Figures; Photos; References; Tables;
  • Pagination: 54 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00608600
  • Record Type: Publication
  • Report/Paper Numbers: FHWA/NJ-91-003, 91-003-7350
  • Contract Numbers: Study 7350
  • Created Date: May 31 1991 12:00AM