Guidelines for Cost-Effective Safety Treatments of Roadside Ditches (2021) / Chapter Skim
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Pages 149-161
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137 CHAPTER 7. SIMULATION SCENARIOS AND RESULTS INTRODUCTION To evaluate vehicle characteristics due to a combination of ditch parameters, encroachment conditions, and vehicle and driver inputs, an extensive simulation effort was needed.
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138 Table 7.1. Vehicle dynamics simulation matrix.
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139 vehicles. The five driver inputs that resulted from the combination of the above conditions are shown in Table 7.4 (also see Chapter 6 for some relevant discussion on steer rates, PRT, etc.)
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140 computational hardware enabled the researchers to investigate a significantly broader range of parameters compared to some of the previous studies. Combinations of all the variables listed in the simulation matrix led to a total of 633,760 simulation cases (57,600 baseline variable cases, 460,800 secondary variable cases, and 115,360 mitigation method cases)
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141 Table 7.5. Simulation outcomes summary.
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142 Figure 7.2. Vehicle response and path for simulation Case 1.
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143 Figure 7.3. Vehicle response and path for simulation Case 2.
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144 Figure 7.4. Vehicle response and path for simulation Case 3.
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145 Figure 7.5. Vehicle response and path for simulation Case 4.
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146 Figure 7.6. Vehicle response and path for simulation Case 5.
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147 Figure 7.7. Comparison of vehicle path.
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148 Figure 7.9. Comparison of vehicle yaw angle.
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149 The simulation cases presented in this chapter were an example of some of the detailed checks performed by the research team. These checks were performed to ensure that results from the analyses were logical and that there were no obvious errors or shortcomings that should be addressed prior to using the simulation data for further statistical analysis in support of developing the ditch design guidelines.
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