You can reduce the duration of PuT Aux path legs, PuT Walk path legs, and Sharing path legs. This is mandatory if large parts of the network are open to such transport systems and if, without a limitation, the number of possible path legs is so high that the memory capacity is insufficient. Moreover, such a limitation can reduce the run time of the procedure.
Reasons concerning the content can frequently lead to such a limitation, too: Walking or going by taxi may be possible anywhere in the network, however, no passenger accepts walk transfers of more than 15 minutes between two lines or uses a taxi in town for over two hours.
The following applies to the limitation of PuT Aux or walk times:
- It affects the precalculation of path legs already.
- It reduces the number of utilized path legs to those with a walk time or PuT-Aux time that does not exceed the preset value.
- It is relevant to timetable-based and headway-based assignments.
- In the case of the walk time it only applies to walk times that arise from links open to walk-TSys and transfers between stop areas of a stop, not to connector times.
- It is to be interpreted per path leg, thus per transfer between two PuT sections of a connection. If, for example, 30 min is entered as walk time, a transfer walk time of 20 min may occur twice on a PuT connection, thus 40 min in total. However, a single transfer cannot take longer than 30 min.
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Notes: Please note, that using such time limitations can also lead to unintended effects. Example: For an OD pair, the ideal connection is a direct 3h trip by taxi (PuT-Aux). Since the maximum duration is limited to 2 h, this path is not permitted. Within the three hours of transfer, the passenger might have the option to do a "loop", either walking or using a PuT-TSys. The passenger thus gets out of the taxi after e.g. one hour and a half, takes a walk in the park, and then takes another taxi to continue his journey. Even though such a loop would not make any sense, it would lead to the fact that the condition would be complied with – by interrupting the total path somewhere in the middle of it. Users can avoid such constellations for one thing by limiting the time in such a way that it encompasses all desired path legs which are thus shorter than the time specified for the limit, and for another thing, by making sure that the whole network is not open to all TSys but that TSys subnetworks are modeled in detail. |
1. From the Calculate menu, choose General procedure settings.
The General procedure settings window opens.
2. In the navigator, select PuT settings > Assignment.
3. Enter the desired value in the input field Maximum duration PuT-Aux path legs.
4. Enter the desired duration for each Sharing transport system in column Maximum duration sharing path legs.
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Note: A value without a unit is interpreted in minutes. The default value for a new Sharing transport system is 2 hours. |
The changes are applied. The next PuT assignment will use the new settings.
