United States Department of Transportation
i
Nighttime visibility of in-service pavement markings, pavement markers, and guardrail delineation in Alaska (with and without continuous lighting).
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2011-03-01
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[PDF-957.47 KB]
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Abstract:This research determined the visibility of in-service pavement markings along lighted and unlighted highway sections, and compared
visibility of in-service pavement markings to the FHWA proposed minimum retroreflectivity levels for the Alaska Department of
Transportation and Public Facilities. In order to measure the visibility, researchers measured nighttime luminance in the field with a
using a customized piece of data collection equipment consisting of an industrial quality hand truck, a regulated switching power
supply, a global positioning system receiver, a light source, a laptop computer, and a charged couple device photometer.
Researchers found that all of the pavement markings tested in this study would be in compliance with the Federal Highway
Administration proposal. Continuous roadway lighting provided better visibility of pavement markings at longer distances than unlit
highways. Along dark rural highways, the visibility of the raised retroreflective pavement markers and guardrail delineation tabs were
greater than the pavement markings. All data collected in this project were under dry weather conditions.
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