Research notes : solar powered markers not up to challenge.
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2008-06-01
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Alternative Title:Solar powered markers not up to challenge.
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Abstract:ODOT performed preliminary tests on eight different models of solar powered raised pavement markers. These included environmental tests (extreme temperatures, immersion), optical performance tests, and observation tests. Federal Highway Administration’s Photometric and Visibility Laboratory at the Turner-Fairbank Highway Research Center conducted additional tests on some of the markers to measure the LED signal and retroreflectivity at different distances and angles. The tests were designed to replicate what drivers would see on the road. It was found that each type of marker had significant shortcomings.
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