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DOI:
https://doi.org/10.14295/transportes.v23i3.886Keywords:
road markings, retroreflectivity, minimum requirements, retroreflectometer.Abstract
Horizontal markings retroreflectivity allows road night visibility, which directly impacts road safety. Brazil employs international standards and minimum retroreflectivity requirements that were partially adapted to the country conditions. In general, such adjustments reduced the security levels of these devices damaging road safety and comfort. From the evaluation of three experimental sections (one highway and two urban avenues) with different markings and materials, over two years, the Brazilian standard procedure was critically analyzed. Also, the impact of rainfall, dirt and retroreflectometer geometry on the horizontal markings performance was addressed. As expected, thermoplastic markings outperformed those with acrylic paint. The abrasive effect of the tire-pavement interaction outwears the markings, reducing the number of retroreflective elements (glass beads); however, the combination of traffic plus rainfall was positive for allowing a "natural" marking cleaning. For the urban section, the effect of dirt was as damaging as the abrasion caused by heavy vehicles. The analysis of retroreflectivity, obtained with different geometries, regarding national and international thresholds, showed that the retroreflectivity minimum levels applied in Brazil are inefficient, deserving, therefore, to be discussed to better serve road safety criteria.Downloads
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