links, which are divided as follows:
- a regular node may correspond to an intersection, a transit stop, etc.
- a centroid is a node associated with a zone: all trips from and to the zone originate and end at that node
- a link is a directional connection between two nodes, using one or more modes
- a connector link is a link which connects a centroid to a regular node
turns: they represent possible turning movements at an intersection; some of them may be penalized or prohibited;
transit vehicles: they correspond to vehicles or combinations of vehicles that may be used by a transit line (e.g.: regular or articulated buses, trains consisting of several cars, etc.);
transit lines: they correspond to regular transit services (fixed frequencies and travel times) on a fixed itinerary; each itinerary is defined as a sequence of transit segments, each of them corresponding to a link in the base network.
Each of these elements may have attributes, which are subdivided into three types:
- standard attributes are a part of the basic network data. These attributes have predefined names, most of them have a special meaning (e.g.: link length), and include three user data items.
- extra attributes are other user-defined attributes. They are created by the user, who gives them a name, a description and a default value.
- assignment results, when available, are stored with some network elements (links, turns, and transit line segments).
This network data set forms a scenario, and an EMME/2 data bank may contain several scenarios. For example, one scenario may correspond to the base year, while others may represent different network variants envisaged for future years.
EMME/2 stores information in a "vertically" structured data format (each e
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