Shortest path search PrT

1. From the Graphics menu, choose Shortest path search.

The Graphics tools (Shortest path search) window opens.

2. Select the PrT tab.

3. Make the desired changes.

Element	Description
Network object type	Here you select the desired network object type. The following types are provided: Zone Node Main node
Transport system	Here you can select a transport system of the PrT.
Route choice criterion	Here you can select the route choice criterion: tCur In-vehicle time in the loaded network t0 In-vehicle time in the unloaded network Impedance Impedance according to the assignment parameters Distance Link length AddValue 1...3 Attributes with user-defined values Notes The attributes tCur, t0, and impedance are time interval-dependent in case of a transport system calculated with SBA. You can therefore specify a Departure time for transport systems calculated with the simulation-based assignment (SBA) to obtain the shortest path for the desired time. If you change the impedance definition, for example, the factor before tCur, you must recalculate the assignment and run the shortest path search again.
Departure time	Enter the desired start time and a start day (when using a calendar) in the fields. Note You can only define a departure time if the transport system has been calculated with the simulation-based assignment (SBA) and the route choice criterion tCur, t0, or impedance has been selected.
Save route index to	Via this button, you can select a link attribute in a separate window which receives the number of the current position for each path leg on the shortest path and which is set to zero for all links which are not located on the shortest path. Note If you open the link list afterwards and sort it by the Index attribute, you can display all attributes along the links of the shortest path. Tip For this purpose you can also create a user-defined attribute (Managing user-defined attributes).

4. In the network, click on the desired start object.

Tip: Alternatively, to select a start object, right-click into the network and search for the desired network object in the Search window. (Finding network objects in the network).

Note: If on the toolbar, the Click only active objects button is activated, you cannot use the mouse to select passive network objects (Marking only active network objects).

A new row is displayed for the selected object in the Selected network objects section.

Tip: To edit the network object displayed, in the Selected network objects section, click the network object. Then in the search window, search for the desired network object (Finding network objects in the network).

5. In the network, click on the desired destination object.

Notes: The start object and the destination object do not have to be of the same network object type. You can change the type by selecting the desired type in the drop-down list of the Graphics tools (shortest path search) window. Do so after selecting the start object and before selecting the destination object in the network.

If you mark a node or main node as destination object, you can mark further network objects and thus add additional paths legs.

Zones can only be start or destination objects of a path. If zones are origins and/or destinations of paths, the respective origin or destination connector times are contained in the resulting output times.

A new row is displayed for the selected object in the Selected network objects section and the shortcut path is displayed in the Network editor window according to the settings.

6. Then take the following actions as needed:

Element	Description
	Click this symbol to delete the list of objects and all previously executed shortest paths
	Use the symbol to restart the shortest path search.
	Use the symbol to reverse the order of the selected objects and thus perform the shortest path search in the opposite direction.

Note: The shortest paths will still be displayed when you exit the window. You can switch off the display by clicking the Initialize button. The results of all shortest path searches will be discarded.

Tips: If the shortest path search is not displayed as desired, you can change the graphic parameters accordingly (Setting the graphic parameters for shortest paths).

You can also display the shortest path search in lists (Displaying shortest path searches in lists).