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Pages 81-117

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From page 81...
... 81   Variable Sensitivity and Importance As described in the preceding chapters, a wide array of roadway and roadside design variables were incorporated into the encroachment simulation matrix as well as the various encroachment relationship models. The variables include horizontal curvature, vertical grade, shoulder width, foreslope ratio, foreslope width, ditch bottom width, backslope ratio, and backslope width.
From page 82...
... 82 Development of Clear Recovery Area Guidelines Figure 54 through Figure 57 present the P(K+A) relationships for different impact speed and impact angle percentile combinations for different clear zone distances.
From page 83...
... Variable Sensitivity and Importance 83   P( K+ A) NOTE: VGrade (% downgrade)
From page 84...
... 84 Development of Clear Recovery Area Guidelines NOTE: VGrade (% downgrade) = vertical grade; HCurveR (degree of curvature)
From page 85...
... Variable Sensitivity and Importance 85   NOTE: VGrade (% downgrade) = vertical grade; HCurveR (degree of curvature)
From page 86...
... 86 Development of Clear Recovery Area Guidelines NOTE: VGrade (% downgrade) = vertical grade; HCurveR (degree of curvature)
From page 87...
... Variable Sensitivity and Importance 87   The research team also performed a sensitivity analysis on the various roadside and roadway design variables. The sensitivity analysis was based on the probability of a fatal or serious injury crash given a vehicle hit a tree P(K+A)
From page 88...
... 88 Development of Clear Recovery Area Guidelines Figure 63.
From page 89...
... Variable Sensitivity and Importance 89   Figure 65.
From page 90...
... 90 Development of Clear Recovery Area Guidelines Figure 67.
From page 91...
... Variable Sensitivity and Importance 91   Case Facility, Speed, and Configuration P(K+A) Difference Case 1 (Flat)
From page 92...
... 92 Development of Clear Recovery Area Guidelines Figure 70.
From page 93...
... Variable Sensitivity and Importance 93   Figure 72.
From page 94...
... 94 Development of Clear Recovery Area Guidelines Figure 74.
From page 95...
... Variable Sensitivity and Importance 95   Figure 75.
From page 96...
... 96 Development of Clear Recovery Area Guidelines P( K+ A) Figure 77.
From page 97...
... Variable Sensitivity and Importance 97   Figure 79.
From page 98...
... 98 Development of Clear Recovery Area Guidelines Table 52 shows the percent difference in P(K+A) values for the different facility types and terrain configurations at a clear zone distance of 30 ft.
From page 99...
... Variable Sensitivity and Importance 99   P( K+ A) Figure 82.
From page 100...
... 100 Development of Clear Recovery Area Guidelines P( K+ A) Figure 84.
From page 101...
... Variable Sensitivity and Importance 101   P( K+ A) Figure 86.
From page 102...
... 102 Development of Clear Recovery Area Guidelines P( K+ A) Figure 87.
From page 103...
... Variable Sensitivity and Importance 103   P( K+ A) Figure 89.
From page 104...
... 104 Development of Clear Recovery Area Guidelines P( K+ A) Figure 91.
From page 105...
... Variable Sensitivity and Importance 105   Case Facility, Speed, and Configuration P(K+A) Difference Case 1 (Flat)
From page 106...
... 106 Development of Clear Recovery Area Guidelines P( K+ A) Figure 94.
From page 107...
... Variable Sensitivity and Importance 107   P( K+ A) Figure 96.
From page 108...
... 108 Development of Clear Recovery Area Guidelines vehicle maintaining more speed based on the further offset of the backslope. The lowest values of P(K+A)
From page 109...
... Variable Sensitivity and Importance 109   P( K+ A) Figure 99.
From page 110...
... 110 Development of Clear Recovery Area Guidelines P( K+ A) Figure 101.
From page 111...
... Variable Sensitivity and Importance 111   P( K+ A) Figure 103.
From page 112...
... 112 Development of Clear Recovery Area Guidelines Case Facility, Speed, and Configuration P(K+A) Difference Case 1 (Flat)
From page 113...
... Variable Sensitivity and Importance 113   P( K+ A) Figure 106.
From page 114...
... 114 Development of Clear Recovery Area Guidelines P( K+ A) Figure 108.
From page 115...
... Variable Sensitivity and Importance 115   P( K+ A) Figure 110.
From page 116...
... 116 Development of Clear Recovery Area Guidelines zone development process. Note that below a certain spacing or density of trees, the projected vehicle envelope (which is a function of the impact angle)
From page 117...
... Variable Sensitivity and Importance 117   It can be observed that hazard density and lateral distance are the most important predictors of P(K+A)

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