Performance of Longitudinal Barriers on Curved, Superelevated Roadway Sections (2019) / Chapter Skim
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31 Crash Data Analysis Crash data analysis is useful in understanding the frequency and severity of crash events and, when the data is adequate, often allows situational, behavioral, and impact influences to be discerned. This research was initiated on the premise that there is a potential safety problem associated with typical longitudinal barriers when they are installed on curved road sections.
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32 both curved and straight roads. The variable "OBJCONT1" in the dataset was used to distinguish between "Concrete traffic barrier" (OBJCONT1 = 54)
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33 Curved Roads Vehicle Class AIS 2– AIS 3+ Total AIS 2– AIS 3+ Total Unweighted Weighted Number Number Total Number Number Number Total Number Passenger Cars 562 199 761 (68.99%)
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34 Table 3.7. Vehicle cases by vertical elevation.
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35 • Crashes into longitudinal barriers on curved roads are more likely to occur on wet, snowy, and icy roads than on dry roads. In Table 3.8, the percentages of crashes on wet, snowy, and icy roads are higher on curved roads than that of the combined (curved and straight)
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36 The data was then sorted based on curvature alignment. Table 3.14 indicates that 25.4% of the vehicle crashes occurred on curved roads while the rest occurred on straight roads.
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37 Straight Roads Vehicle Class Total Total Unweighted Weighted Number Number Total Number Number Number Total Number Passenger Cars 14,917 2,600 17,517 (63.66%)
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38 • Other parameters (lighting condition, weather condition, and posted speed) did not show significant effects on the crash distribution when comparing cases on curved roads to the combined (curved and straight)
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40 Table 3.25. Vehicle crashes by vehicle and barrier type for straight roads.
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41 Table 3.28. Vehicle cases by road surface condition.
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42 performance when installed on curved road sections. This dataset supplements existing NASS/CDS data with additional information pertaining to the roadside such as side slope, roadway alignment, curvature, grade, profile, and roadside barrier characteristics (including post-crash measurements)
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43 severities. Data for 1988 through 2009 was analyzed for crashes into concrete barriers, other guardrail, and bridge rails.
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