Review of Truck Characteristics as Factors in Roadway Design (2003) / Chapter Skim
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Pages 153-159
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From page 153... ...
D-1 APPENDIX D FIELD ESTIMATES OF TRUCK WEIGHT-TO-POWER RATIOS A key issue in need of resolution is the distribution of truck characteristics related to performance on upgrades, particularly truck weight-to-power ratios. For over 30 years, from the 1950s through the 1980s, truck weight-to-power ratios decreased dramatically as truck engines became more and more powerful.
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From page 154... ...
in this study. The following criteria were used to evaluate the appropriateness of a grade for purposes of this study.
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D-3 State Route MP/Segmen t Directi on Name of pass/area Type of site Dates of data collection Avera ge grade (%) Local grade (%)
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D-4 Number of observations 1,195 25th percentile ratio 112 Median ratio 141 75th percentile ratio 164 85th percentile ratio 183 90th percentile ratio 198 Weight-to-Power Ratio (lb/hp) Figure D-5.
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From page 157... ...
D-5 Number of observations 734 25th percentile ratio 87 Median ratio 115 75th percentile ratio 152 85th percentile ratio 169 90th percentile ratio 179 Weight-to-Power Ratio (lb/hp) Figure D-6.
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From page 158... ...
D-6 Weight-to-power (lb/hp) ratio Percentile California Colorado Pennsylvania 5th 83 69 111 25th 112 87 142 50th 141 115 168 75th 164 152 194 85th 183 169 207 90th 198 179 220 95th 224 199 251 TABLE D-3 Summary of truck weight-to-power ratios for freeway sites Number of observations 250 25th percentile ratio 144 Median ratio 186 75th percentile ratio 226 85th percentile ratio 246 90th percentile ratio 262 Weight-to-Power Ratio (lb/hp)
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From page 159... ...
Pennsylvania. For two-lane highways, a 108-kg/kW [180lb/hp]
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