Review of Truck Characteristics as Factors in Roadway Design (2003) / Chapter Skim
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Pages 22-38
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22 CHAPTER 4 DESIGN VEHICLES This chapter reviews the design vehicles used in the 2001 Green Book and presents recommended changes to the design vehicles for consideration in future editions of the Green Book. This chapter also describes the recommended changes in design vehicles and documents the reasons for these recommended changes.
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23 TABLE 19 Design vehicle dimensions from the 2001 Green Book (1) Metric Dimensions (m)
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24 TABLE 19 (Continued) US Customary Dimensions (ft)
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25 hypothesizing future truck populations are (1) the current truck population, (2)
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26 trucking industry that haul bulky, low-density freight. The ability of states to permit new LCV operations has been frozen by Congress (limited to operations that were legal prior to the early 1990s)
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27 ommended that Federal law be changed to allow two specific truck types to operate under state permits: • Six-axle tractor-semitrailers with a maximum weight of 35,400 kg [90,000 lb] ; and • Double-trailer configurations with each trailer up to 10.1 m [33 ft]
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28 tractor; in actual practice, the kingpin is often set forward about 0.3 m [1 ft] from the axle centerline.
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29 the largest tractor-semitrailer on the highway.
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30 Figure 6. Dimensions of intermediate semitrailer (WB-12 [WB-40]
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31 12.5-m [41-ft] dimension.
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32 more flexibility in loading the truck, and in keeping the load on the steering axle of the tractor to a more driver-friendly level. With a normal tandem spacing, the maximum GVW of 36,400 kg [80,000 lb]
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33 For other configurations, the use of trailer types other than vans have been discussed. However, it is doubtful that there are many 16.2-m [53-ft]
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34 six-axle trucks to carry greater loads than five-axle trucks. Such a change in Federal law has been recently recommended in TRB Special Report 267 (13)
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35 The WB-20D [WB-67D] "twin-trailer" truck with two 8.7-m [28.5-ft]
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36 a 90-deg right turn with a 22.9-m [75-ft] radius, while a Turnpike Double with 14.6-m [48-ft]
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37 Tractor/Semitrailer/Semitrailer Combinations (B-Trains) B-Train double-trailer trucks are fairly common in Canada and are used to some extent in some of the northern tier of the United States.
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38 • The WB-19 [WB-62] design vehicle represents a truck configuration specified in Federal law and should be retained.
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