Using polygon nodes and segment nodes
Vissim distinguishes between polygon nodes and segment nodes:
Polygon nodes: in figure, node 70. By default, polygon nodes are used in Vissim because they can be easily defined and edited. You always add a node as a polygon node in Vissim (Defining nodes).
Segment nodes consist of link segments, as shown in figure node 69.
Segment nodes allow for more detailed editing of a node, as you can modify individual segments (Selecting nodes, polygons or segments). Example: In the network editor, a polygon node is defined where a highway on a bridge crosses a road running underneath. You can convert the polygon node into a segment node and remove the highway segments from the node, so the highway is no longer part of the node (Deleting segments of an edge from segment nodes).
ANM import generates segment nodes
During the ANM import of external data, nodes in Vissim are always generated as link segments (Importing ANM data).
Converting polygon nodes to segment nodes or vice versa
A polygon node can be converted into a segment node and vice versa (Converting polygon nodes), (Converting segment nodes). If you have imported a node as a link segment, you can convert it to a polygon node, in order to change its spatial extent at the polygon level to the segment level (Converting segment nodes).
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Notes:
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