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Defining dynamic routing decisions

Vehicles that are routed by the dynamic assignment ignore all static routing decisions along their way. With dynamic routing decisions you can trigger a new path selection for these vehicles.

On a dynamic routing decision, a vehicle decides if a specific condition has been fulfilled, for example, if its destination parking lot is full. If the condition is fulfilled, a new parking lot selection and a new path selection are carried out according to the given strategy. The strategy also determines the parking lots which are available for selection.

Path selection for dynamic routing decisions uses the same generalized costs of the edges as path selection of dynamic assignment in the current evaluation interval.

Destination parking lot selection depends on the following settings made in the parameters of dynamic assignment, on the Cost tab, in the section Cost for path distribution with Kirchhoff:

• If Measured path travel times is selected, destination parking lot selection uses generalized costs of paths from the second simulation run. For the first simulation run, the total of edge lengths is used, as there is still no data available on the travel time. From the start of the edge, the distance from the end of the origin parking lot to the first node border is taken into account. From the end of edge, only the distance from the last node border to the beginning of the destination parking lot is considered.
• If the Sum of edge travel times is selected, the entire length of all edges is used.

Dynamic routing decisions also affect vehicles driving on a toll route. The vehicle can leave the toll route.

1.  In the Network objects toolbar, click the Vehicle Routes button.

The button is highlighted. The variant of the network object type is displayed in parentheses and the button is shown.

2.  Re-click the button Vehicle Routes.

A list box with the variants of the network object type opens.

3.  Select the entry Dynamic.

4.  In the Network Editor, right-click the desired position of the Routing decision section in the desired link or connector.

5.  From the context menu, choose Add New Dynamic Vehicle Routing Decision.

A red purple is shown at that position.

6.  Edit the attributes (Attributes of dynamic routing decisions).