Grade Separated Crossings

Figure 22-6 shows our example enhanced by annotations describing the highway interchange. Here a Grade Separated Crossing consists of two Paths that cross but do not communicate directly with each other. In the example, it would not be possible to simply turn left from Highway 2 in order to get to Highway 14. It is necessary to take a Ramp.

Figure 22-6: A Sample Interchange

The Ramp is a Roadway Path that begins at Grade Crossing 1054-3 and ends at Grade Crossing 1054-2. Since it is not a single highway, here the Ramp is simply labeled Ramp 2-14. The value of its Bi-directional Indicator is clearly “False”—traffic ...

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