Timetable-based assignment: Preselection page

The settings in the drop-down list apply to OD pairs for which connections with and without public transport have been found. In case of a connection with PuT, at least one line, Aux or Sharing transport system is boarded. In case of a connection without PuT, no PuT transport system is boarded. Only access, egress, and walk links are used.

Delete all connections using PuT lines

All connections for an OD pair either found by the path search procedure or imported during connection import, that include at least one boarding of a PuT transport system are deleted.

Delete all connections without PuT

All connections for an OD pair either found by the path search procedure or imported during connection import, that do not include PuT transport system boardings (e.g. using only walk links) are deleted.

Note

This option is not relevant if, under Calculate > General procedure settings > PuT settings > Assignment > Walk links from/to connectors, you have selected Walk links between zones not permitted or Force boarding/alighting at connected node. In this case, no connections without PuT are found (Restricting the walk link search).

Do not delete any connection

None of the connections for an OD pair either found by the path search procedure or read in during the connection import is deleted.

Select this option to delete connections that either arrive within the pre-assignment period, i.e. before the assignment period starts, or depart after the post-assignment period, i.e. after the assignment period ends.

Notes

Those connections might be found - and loaded - because of the pre-assignment period or post-assignment period in the timetable-based assignment. They may also be read from file.

Those connections do not affect most of the skims as they are usually charged with fewer passengers and thus have less weight. However, when calculating the service frequency, each connection is counted. This option can be used to determine the precise number of connections that depart within the assignment period.

For departure time related demand segments, select this option to delete connections that depart before the assignment period starts.

For each OD pair, all connections - either found by the connection search or imported from a connection file - that were not deleted for other reasons yet, are evaluated prior to connection choice. The following criteria are verified. If applicable, connections are deleted. You may adjust the conditions with the help of factors and addends.

Note

The criteria are checked in exactly that order.

1. Search impedance > factor • minimum search impedance + addend

Connections are deleted if their search impedances are very high compared to the minimum search impedance of the OD pair.

Notes

This option is only provided if either - on the Search page - option Branch & bound search has been checked or after a connection import.

The impedance used here corresponds to the Search impedance defined on the Branch and Bound page.

Journey time > factor • minimum journey time + addend and number of transfers > minimum number of transfers

or

Number of transfers > minimum number of transfers + addend and journey time > minimum journey time

To all remaining connections applies:

Connections are deleted if two conditions are satisfied: Compared to the minimum journey time per OD pair their journey times are extremely long and their numbers of transfers exceed the minimum number of transfers.

Connections are also deleted if these two conditions are satisfied: Their numbers of transfers exceed the minimum number of transfers per OD pair by a certain number of transfers and their journey times exceed the minimum journey time.