As an example, you can use this feature to test the performance of main nodes. It is only effective for main nodes for which the impedance method ICA (Intersection Capacity Analysis) is specified (Calculating and exporting ICA).
If you want to update the impedance of a main node that has an associated signal controller, you can specify that the signal cycle and split optimization is carried out for the signal controller at the same time.
You can execute the functionality for all, all active main nodes, or main nodes marked in the network editor.
Editing the attribute values of all or all active main nodes
1. If required, set the main nodes active, whose impedances you want to update. To do this, use
- the spatial selection (Setting network objects active/passive via the spatial selection) and/or
- filter criteria (Using filters to set network objects active or passive).
The selected main nodes are active.
2. In the Network window, right-click the Main nodes button.
The Main nodes shortcut menu opens.
3. Select the entry Update impedances/Optimize signal controller.
The Update main node impedances window opens.
4. If necessary, select the Only edit active objects option.
5. If you want to execute the signal cycle and split optimization for main nodes with a signal controller, select the Signal cycle and split optimization option.
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Element |
Description |
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Signal cycle and split optimization |
If this option has been selected, Visum checks for all main nodes with a signal controller which optimization method has been specified for the signal controller (Properties and options of signal controllers). Dependent on the specified optimization method, no optimization, only the signal split optimization or the signal cycle and split optimization is carried out. Use global design hourly volume If the option is selected, the global design hourly volume set under Calculate > General procedure parameters > PrT settings > Impedances at node is used for optimization. Use design hourly volume from attribute If the option is selected, specify a numerical turn attribute for the optimization, which is multiplied by the specified factor. |
6. Confirm with OK.
The impedances are updated.
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Note: If a main node is allocated to a signal controller, impedances and optimizations are always calculated simultaneously for all nodes and main nodes that are allocated to this signal controller. |
Editing marked main nodes
1. In the network, mark all main nodes whose impedances you want to update.
2. Right-click in the network display.
A shortcut menu opens.
3. Select the entry Update impedances/Optimize signal controller.
4. If you want to execute the signal cycle and split optimization for main nodes with a signal controller, select the Signal cycle and split optimization option.
5. Confirm with OK.
The impedances are updated at the selected main nodes. If the Signal cycle and split optimization option has been selected, for nodes with a signal control either no optimization, only the signal split optimization, or the signal cycle and split optimization is carried out. This depends on the optimization method specified for the signal control.
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Tip: You can also call the function from the shortcut menu of the corresponding list and edit marked objects together. |
