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Pages 1-3

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From page 1...
... 1   Design vehicles used in AASHTO's A Policy on Geometric Design of Highways and Streets (Green Book) generally have larger physical dimensions and larger minimum turning radii than most vehicles in their class.
From page 2...
... 2 Highway and Street Design Vehicles: An Update Thus, it appears that most of the combination truck design vehicles should become slightly longer because the size of the tractors has increased. It appears appropriate to increase the trailer length for one of the current combination truck design vehicles that is shorter than, and therefore not constrained by, existing state limits on trailer length.
From page 3...
... Summary 3   for left turns and minimum median width for U-turns on divided highways should also be updated. The discussion in Chapter 9 of the Green Book on the design of roundabouts should mention the potential use of a mountable apron on the outside of the central island that may be encroached on by large vehicles.

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