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Defining meso network nodes

Please note the rules and examples for defining nodes and meso network nodes (Modeling nodes), (Modeling meso network nodes). In addition, consider the following limitations and information:

• Limit the extent of a meso network node to the necessary maximum extent. Conflict areas in particular do not have to lie entirely within the node.
• Ensure that there is a sufficient distance between the meso nodes. This includes the distance between automatically generated meso nodes that are not of the type A Node (Attributes of meso nodes).
• Meso network nodes must not overlap.
• When modeling meso network nodes, please note that during dynamic assignment, path search and path selection are performed based on the generalized costs of edges and/or paths of dynamic assignment. When creating networks for mesoscopic simulation in Vissim, you therefore generally select the UseForDynAssign attribute (Defining nodes).
• In networks imported via ANM import, for some intersections (e.g. roundabouts or intersections with lane widening) nodes are created with either the UseForDynAssign attribute or the UseforMeso attribute selected. Nodes with the UseForDynAssign attribute are exclusively used for calculations performed within dynamic assignment and the path file. These nodes must also not overlap. In principle, the attributes UseForDynAssign and UseForMeso may be selected independently from each other.
• You can use nodes of dynamic assignment to control the path selection based on edge closures (in the figure below, the outer node) and meso network nodes (in the figure below, the eight node in the roundabout), as described in the respective rules (Rules and examples for defining meso network nodes):

1.  Define the desired meso network nodes according to the definition of nodes (Modeling nodes), (Defining nodes).

The Nodes window opens.

2.  In the Nodes window, select Use for mesoscopic simulation.

The node then becomes a meso node. When creating a meso graph, Vissim automatically generates a meso node for each meso network node modeled and assigns it the attribute Node (Attributes of meso nodes).