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Journal Article

Citation

Nelson TM, Ladan CJ, Kuchinski DD. J. Saf. Res. 1976; 8(1): 23-29.

Affiliation

Nelson, T. M.: U Alberta, Edmonton, Canada

Copyright

(Copyright © 1976, U.S. National Safety Council, Publisher Elsevier Publishing)

DOI

unavailable

PMID

unavailable

Abstract

Laboratory studies have shown curved markers to be more efficient at signaling traffic commands at acute angle intersections than conventional flat markers. An on-site study was therefore undertaken to compare the signaling efficiency of the three marker types: standard two-dimensional marker; hooded standard marker; and curved marker. The study site was two city streets intersecting at any 11° 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 two 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 several aerial mosaics of all 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 air arrest bonds with flat and curved markers indicated that curved markers would improve signaling and a substantial proportion of the intersections.

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