Superelevation Criteria for Sharp Horizontal Curves on Steep Grades (2014) / Chapter Skim
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Pages 157-161
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From page 157... ...
157 S E C T I O N 5 An analysis of the crashes that occurred at the field data collection sites was conducted to determine the statistical correlation between crash frequency/rate and margin of safety against skidding (i.e., lateral friction margin) and margin of safety against rollover (i.e., rollover margin)
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State Site No. MOS for passenger vehicles MOS for trucks Skid (mean supply)
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159 vehicles and trucks. The years for which the traffic volume and crash data were obtained for each state are as follows: • CA (2004-2008)
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160 Parameter Coefficient estimate Standard error Wald 95% confidence limits Wald chi-square Chi-square p-value Significant at 10% level? MOS Skid (minimum supply)
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Pr ed ic te d SV RO LL C ra sh es /m i/y r 0 1 2 3 4 5 6 7 8 9 10 Passenger vehicle MOS Rollover 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 Vertical lines indicate interval of MOS values from 16 downgrade study sites Dashed lines represent 95% confidence limits Passenger vehicle AADT = 7,300 veh/day (median) ; Curve Length = 0.34 mi (median)
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