The transport system-based assignment does not differentiate between individual PuT lines. Modeling the transport supply only considers the links of a basic network with their specific run times. The basic network can comprehend the following sets of links.
- All road and rail links of the link network
- Only those links traversed by PuT lines
- Only those links traversed by active PuT lines
From the links of this basic network a graph is constructed which is the basis for a best-route search.
Because individual lines are not distinguished, transfer stops with their respective transfer times cannot be included in the search. It is possible, however, to consider transfer times between different transport systems (transfer penalties for transport system changes, for example between bus and train).
The transport system-based assignment calculates exactly one route for each pair of origin zone and destination zone, which consists of one origin connector and one destination connector for the PuT as well as of links and turns, which are permitted for a public transport system. Transfers are changes of the transport system which are considered in the form of a time penalty in the route search.
- For links, t-PuTSys is considered
- A transport system change can only take place at selected nodes
- At nodes, where a transport system change is necessary, a transfer time penalty TP is assigned
- TP = node type-specific time penalty + penalty per transfer
- At nodes, at which no turn for the public transport system is permitted between the links, the time penalty TP is also added if option Consider prohibited turns is active.
- The result of a transport system based assignment is stored in link volumes and skim matrices. The individual paths can no longer be accessed.
