Laboratory studies have shown curved markers to be more efficient at signalling traffic commands at acute-angle intersections than conventional flat markers. An on-site study was therefore undertaken to compare the signalling efficiency of three marker types: (1) standard two- dimensional marker; (2) hooded standard marker; and (3) curved marker. The study site was 2 city streets intersecting an eleven degree angle, with one of the streets controlled by a Yield sign. Results showed that the curved marker elicited a significantly higher percentage of correct responses than the 2 conventional signs in nonrush-hour traffic when the driver was in the lane expected to yield. Similar results occurred when the data were averaged across traffic conditions, but not under rush-hour conditions when responses appeared to be nondiscriminative of marker type. There were no significant differences among marker types when the driver was in the thoroughfare lane. In order to determine the potential applicability of the curved marker, measurements were made from aerial mosaics of all of the intersections on a major Alberta highway. There were more acute-angle than right-angle intersections controlled by markers on this highway, and hypothetical projections of error response with flat and curved markers indicated that curved markers would improve signalling at a substantial proportion of the intersections. The combined results indicate a need for additional on-site study. /Author/

  • Availability:
  • Corporate Authors:

    Oxford University Press

    Press Road, Neasden
    London NW10 0DD,   England 
  • Authors:
    • Nelson, T M
    • Ladan, C J
    • Kuchinski, D D
  • Publication Date: 1976-3

Media Info

  • Features: Figures; References; Tables;
  • Pagination: p. 23-29
  • Serial:
    • Volume: 8
    • Issue Number: 1
    • Publisher: Blackwell Scientific Publications Limited
    • ISSN: 0022-4588

Subject/Index Terms

Filing Info

  • Accession Number: 00139987
  • Record Type: Publication
  • Source Agency: National Safety Council Safety Research Info Serv
  • Files: TRIS
  • Created Date: Oct 6 1976 12:00AM