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Pages 4-8

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From page 4...
... 4 1.1 Background The design vehicles presented in Chapter 2 (Design Controls and Criteria) of the AASHTO A Policy on Geometric Design of Highways and Streets, commonly known as the Green Book, are the key to design decisions appropriate to accommodate large vehicles on the road network (AASHTO 2018)
From page 5...
... Introduction 5 that is likely to use that facility with considerable frequency or a design vehicle with special characteristics appropriate to a particular location. The primary application of design vehicles in the project development process is to help designers decide what geometrics should be used to accommodate larger vehicles at locations where such vehicles turn, including intersections, median openings, ramps, and horizontal curves.
From page 6...
... 6 Highway and Street Design Vehicles: An Update Source: Harwood et al.
From page 7...
... Introduction 7 Information about typical vehicle dimensions has been gathered in this research with careful attention to variations in definitions of the dimensions that may be used in specific sources. For example, a key dimension that influences vehicle offtracking and swept path width for tractorsemitrailer trucks is the kingpin-to-rear-axle (KPRA)
From page 8...
... 8 Highway and Street Design Vehicles: An Update 1.2 Objectives and Scope The objective of the research in NCHRP Project 07-27 is to develop design vehicle material for the forthcoming 8th edition of the Green Book that realistically represents the critical vehicles that influence geometric designs. The material should include the following: • Critical dimensions and specifications (or ranges)

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