Automatic Network Transformation

While the proposed topological transformation of the transfer node is quite simple in principle, it is still not a trivial task to actually carry out the corresponding network modifications in EMME/2. Of course it is possible to do it interactively, but the task is cumbersome, repetitive and prone to errors. Hence, it is really desirable to automate this procedure. Since the topological transformation to be performed is based on a small set of simple and strict rules, it is possible to implement the entire procedure as an EMME/2 macro.

In the following, we describe a prototype implementation of such a macro. It is calLED transfer and is based on the Beta Release 5+ EMME/2 version of EMME/2 (a pre-release version containing some of the new features which will be part of Release 6). In particular the new possibilities of editing networks using batch input proved very useful when developing the macro.

The macro ``blows up'' a given transfer node, by modifying the node, link and transit line table of the current scenario. If the line-to-line transfers are needed for several transfer nodes, the macro can simply be applied repetitively. Here a brief description of the steps performed in the macro:

1. The transfer node itself, as well as all incoming and outgoing base network links are punched using module 2.14.
2. A file containing all line segments ending at the selected transfer node is generated using the network calculator in module 2.41.
3. All transit lines are punched using module 2.24.
4. The transit line

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