Creating and using edges

At the start of the dynamic assignment, Vissim automatically generates an abstract network graph based on the user-defined node. You can also generate this node-edge graph via a function (Generating a node-edge graph). The node-edge graph may consist of the following edges:

• Turn relations: edges within a node
• Edges from node to node. An edge starts at the border of node and ends at the border of a node.

Differences from standard network graph

The topology of the node-edge graph is only slightly different from the standard network graph in traffic flow models:

• There may be more than one edge between two Vissim nodes.
• The turn relations within nodes are not just abstract entities, but are represented by edges which have a real length in Vissim.

Use of edges

Edges are the elementary components of the path search because paths are sequences of edges. At the edge level, travel times and costs are recorded in the simulation and made available for the path selection in the next iteration.

If for the attribute Blocked vehicle classes for dynamic assignment(Connector closed to) of a connector, the number of vehicle classes selected results in all vehicle types being closed to the connector, this connector is not used by network graph edges. If a managed lane route leads via this connector, its managed lanes routing decision does not take effect.