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Review of truck characteristics as factors in roadway design by Douglas W Harwood; National Cooperative Highway Research

By Douglas W Harwood; National Cooperative Highway Research Program.; National Research Council (U.S.). Transportation Research Board.; American Association of State Highway and Transportation Officials.; United States. Federal Highway Administration.; et al

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Highways. S. S. 4 ridors. S. S. highways. 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. The Green Book does not specify which design vehicle should be selected for the design of any specific highway project.

This increase in loading of the rear tandem axle by spreading the rear axles farther apart does not permit the gross vehicle weight (GVW) of the truck to legally exceed 36,400 kg [80,000 lb], but it is popular with truckers in that it provides . Figure 10. Recommended revision in the dimensions of interstate semitrailer (WB-19 [WB-62]) design vehicle. 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 spread tandem at the rear of the trailer, the 36,400-kg [80,000-lb] load can be moved somewhat rearward, keeping all axle loads at or below their individual maxima.

This Figure 15. future use. design vehicle acquired its name because it was first permitted to operate on a number of Eastern toll roads and turnpikes. Turnpike Doubles generally operate only under permit on specific roadways approved for their use. The situations in which a Turnpike Double is the appropriate design vehicle are typically quite limited because Turnpike Doubles are often made up and broken down at staging areas at the entrances to or exits from specific highway facilities; they do not typically operate beyond that point onto the local road system.

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