Visibility Effectiveness of Hemisphere and Corner Cube Retroreflective Pavement Markers on Curved Roads
Publication: Journal of Transportation Engineering
Volume 129, Issue 1
Abstract
This study was conducted to investigate the visibility effectiveness of hemisphere and corner cube pavement markers on various curved road driving conditions. The study consisted of a field experiment to investigate visual threshold and an evaluation study to investigate visibility effectiveness. In the field experiment, a U-shaped test track with a curvature of 30 m radius was set up to investigate the visibility threshold. Two marker types, the hemisphere and the corner cube, and two directional driving conditions, right-turn and left-turn conditions, were considered. The results indicate that there is no difference between marker types, but there are differences between turning directions. The left turn has a significantly higher value and is therefore determined to be the resultant visual threshold. The resultant visual threshold is and this is significantly higher than the recommendation of the Commission Internationale de l’Eclairage (CIE). The evaluation study was to evaluate the visibility effectiveness of these two markers on eight curved roads with different radii based on the resultant visual threshold. The evaluation indicates that both pavement markers meet the 3 s preview time as suggested by CIE. However, it also suggests that the corner cube is superior on roads with radii greater than 60 m, whereas the hemisphere is much better for the roads with radii smaller than 60 m.
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Information & Authors
Information
Published In
Journal of Transportation Engineering
Volume 129 • Issue 1 • January 2003
Pages: 77 - 83
Copyright
Copyright © 2003 American Society of Civil Engineers.
History
Received: May 8, 2001
Accepted: Dec 18, 2001
Published online: Dec 13, 2002
Published in print: Jan 2003
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