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- W132392009 abstract "Transportation agencies make efforts to help drivers navigate roads in a safer and more efficient manner through replacement of ineffective signs. Because a deficiency in sign visibility can cause crashes to occur, the 2009 Manual on Uniform Traffic Control Devices (MUTCD) issued a mandate requiring implementation of retroreflectivity assessment and management plans across the country to achieve and maintain minimum safe levels. Signs in Utah suffer from retroreflectivity degradation for many reasons but one leading contributor is the severe air pollution that engulfs some parts of the state. This observation is consistent with research findings that identify air pollution particulate matters as a contributing factor in the sign retroreflectivity performance. With a focus on coarse particulate matter (PM10), this research was conducted to quantify the effects of PM10 air pollutant on retroreflectivity performance. PM10 data obtained from official online resources, was combined with sign retroreflectivity measurements obtained from a sample data set of over 1,700 signs under Utah Department of Transportation’s (UDOT) jurisdiction. Relationships between PM10 levels and sign retroreflectivity were established using linear regression models as well as quadratic polynomial models. Separate models were derived to account for variation in sign background color and reflective sheeting type. At its completion of the analysis, it was determined that Types IX and XI signs were more likely than Types I, III, and III HIP signs to exhibit changes in their retroreflective performance as PM10 components vary, especially, for signs in color of red. While second-order polynomial regression models were found to produce better R² values than linear regression models, the research indicates that there is considerable influence by other contributing factors. That said, the findings of this research are sufficient to help agencies identify management plans that prioritize routes that need more frequent assessment of sign visibility based on PM10 components." @default.
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- W132392009 date "2015-01-01" @default.
- W132392009 modified "2023-09-28" @default.
- W132392009 title "Analysis of the Effects of Coarse Particulate Matter (PM10) on Traffic Sign Retroreflectivity" @default.
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