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Kevin V. Laxar

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Publications by Kevin V. Laxar (bibliography)

1995

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Laxar, Kevin V. and Benoit, Sandra L. (1995): The Conspicuity of Flashing Lights as Marine Aids to Navigation. In: Proceedings of the Human Factors and Ergonomics Society 39th Annual Meeting 1995. pp. 1380-1384.

“Mariners frequently have trouble distinguishing lighted aids to navigation in areas with a high density of background lights. The Coast Guard is seeking ways to enhance the conspicuity, or likelihood of being noticed, of these aids. Literature has shown that a flashing light is more conspicuous than one that is steady. To improve conspicuity by determining optimal flash characteristics, we had 20 observers search for a flashing point of light among backgrounds of steady lights on a CRT screen. In single 360 trial sessions, observers indicated which of five screen sectors contained the flashing target, and accuracy and response time were recorded. Targets were flashed at 1, 2, and 3.85 Hz, each at duty cycles of .3, .5, and .8. An ANOVA showed significant effects of frequency, duty cycle, and background light density. Search time increased with number of background lights. Conspicuity improved as frequency increased and as duty cycle decreased.”

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