Understanding Corridors

In its simplest form, a corridor is a three-dimensional combination of an alignment, a profile, and an assembly (see Figure 9-1).

Figure 9-1: A corridor shown in 3D view

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You can also build corridors with additional combinations of alignments, profiles, and assemblies to make complicated intersections, interchanges, and branching streams (see Figure 9-2).

Figure 9-2: An intersection modeled with a corridor

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The horizontal properties of the alignment, the vertical properties of the profile, and the cross-sectional properties ...

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