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Pages 9-19

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From page 9...
... 9   This section discusses the design vehicles used in the Green Book, defines the basic vehicle types used as design vehicles, and defines their key dimensions and characteristics, including vehicle length, vehicle height, vehicle width, track width, vehicle wheelbase(s) , front overhang, rear overhang, number of axles, and connection types in multi-unit combination vehicles.
From page 10...
... Source: AASHTO 2018. Design vehicle type Symbol Dimensions (ft)
From page 11...
... Key Vehicle Characteristics 11 Figure 3. Dimension terminology for a passenger car.
From page 12...
... 12 Highway and Street Design Vehicles: An Update Figure 6 shows the key dimensions that need to be specified for a tractor-trailer combination truck with a single trailer, including overall vehicle length, front overhang, tractor wheelbase, trailer length, trailer wheelbase, location of the connection between tractor and trailer, KPRA distance, and rear trailer overhang. A combination vehicle that consists of two or more separate units that can rotate with respect to one another is called an articulated vehicle.
From page 13...
... Key Vehicle Characteristics 13 Figure 7. Dimension terminology for an articulated bus.
From page 14...
... 14 Highway and Street Design Vehicles: An Update RVs presented in the current Green Book include motor homes, a travel or camping trailer pulled by a passenger car, a boat trailer pulled by a passenger car, and a boat trailer pulled by a motor home. The key dimensions of motor homes are comparable to those for a single-unit truck, as shown in Figure 4, and a conventional bus, as shown in Figure 5.
From page 15...
... Key Vehicle Characteristics 15 • Track width: The track width of the vehicle is the distance between the left edge of the left tire and the right edge of the right tire of a vehicle axle. On many vehicles, the track width for various axles may differ.
From page 16...
... 16 Highway and Street Design Vehicles: An Update 2.4 Vehicle Turning Radius Table 2 shows the turning radii of the 20 design vehicles presented in the Green Book. For each design vehicle, the table includes the following: • Minimum design turning radius • Centerline turning radius • Minimum inside radius The turning radii shown in Table 2 are defined as follows: • Minimum design turning radius (MDTR)
From page 17...
... Key Vehicle Characteristics 17 These turning radii are illustrated in the turning template presented in Figure 2. Each of the turning radii defined has a corresponding turning diameter that is twice the turning radius.
From page 18...
... 18 Highway and Street Design Vehicles: An Update R = radius of curvature of the path of the centerline of the front axle (ft)
From page 19...
... Key Vehicle Characteristics 19 Turning templates for intersection design, like those presented in Chapter 6 are based on lowspeed turning maneuvers (10 mph) on a level pavement.

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