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Develop metrics of tire debris on Texas highways : technical report.
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2017-05-01
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[PDF-9.39 MB]
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Abstract:This research effort estimated the amount, characteristics, costs, and safety implications of tire debris on Texas highways. The metrics developed by this research are based on several sources of data, including a statewide survey of debris removal practices, field data from a probability sample of Texas roads, Texas Department of Transportation crash databases, and publically available reports on economic and environmental impact of road debris.
A statewide survey found differences in road debris removal practices among districts. A cost analysis showed that the unit cost of debris removal activities increases with increasing proportion of contractor debris removal.
Data from a
probability sample of Texas highways were obtained. This probability sample represented approximately 2289 lane-miles, or 443 centerline miles, of Texas highways. A total of 14,998 pieces of tire debris were identified from this sample, and their dimensions were estimated using an image-processing procedure.
A safety assessment of tire debris on Texas highways was performed. It was found that tire debris crashes are extremely rare, amounting to less than 0.1 percent of all crashes in Texas. However, this research found that the odds of this type of crash increase with increasing speed limits, truck percent, and number of lanes, as well as on rural rather than urban facilities.
A suit of statewide metrics of tire debris metrics was generated. It is estimated that between 1,389.2 and 7,226.1 metric tons of tire debris were left on Texas highways last year. Between 501.4 and 3,616.3 metric tons corresponded to pieces of tire debris 64 in.2 or bigger. The statewide generation rate of tire debris was estimated to be between 10.27 and 13.94 lb per mile of highway per week.
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