Factors Contributing to Median Encroachments and Cross-Median Crashes (2014) / Chapter Skim
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Pages 56-62
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From page 56... ...
56 Crash Data Analyses to Investigate Contributing Factors This section of the report presents crash data analyses conducted to investigate the key factors contributing to driver workload identified in Section 4 and to confirm their role in median-related crashes. The key contributing factors addressed are ramps, sharp curves, and steep grades.
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57 Generally, the Interstate Highway System in the United States has been designed with a maximum grade of 3 percent, except that grades up to 6 percent are permitted in rolling or mountainous terrain (54)
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58 Curve category (radius/direction) Freeway segments Number of medianrelated crashes (2004–2008)
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Ramp/curve combination (ramp type/radius/ direction) Freeway segments Number of medianrelated crashes (2004–2008)
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60 5.3 Comparison of Results for Median-Related Crashes to Other Crash Types Table 5-6 summarizes the crash data for rural freeways in Washington by crash type (median-related crashes, run-offroad right crashes, and on-road crashes)
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61 Type of segment Crash rate per mile per year (2004–2008) Crash rate per MVMT (2004–2008)
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62 • For sites with curves, the percentage of median-related crashes on wet and snow-covered pavements increases as the curve radius decreases. • Sites with steep grades experience a higher percentage of median-related crashes on wet or snow-covered pavement than sites not on steep grades.
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