Input attributes
Network modeling must meet certain requirements before the simulation-based dynamic assignment can be carried out successfully. For the network, define permitted PrT transport systems in the usual way. In addition, the set of permitted transport systems for individual lanes of a link can be further restricted, e.g. to represent special lanes for certain vehicles in the model. Furthermore, detailed junction modeling is required, i.e. lanes, lane turns, and junction control data must be defined.
Other input attributes required can be distinguished as follows and are listed in the respective tables:
- Input attributes of the car following model (Table 146)
- Other input attributes for simulation (Table 147)
- Additional input attributes for node modeling (Table 148)
- Input attributes for calculating node impedances (Table 150)
- Time-dependent supply data in time-varying attributes (optional)
The following table provides an overview of the time-varying attributes that you can use in SBA:
|
Network object |
Attributes |
|
Link |
v0, Toll_PrTSys, TSysSet |
|
Lane |
TSysSet |
|
Restricted traffic area |
AreaToll-PrTSys |
Table 156: Time-varying attributes valid for SBA
The TSysSet attribute can be used to model temporary link and lane closures. For this, the value of the attribute must be empty.
Output attributes
Output attributes of simulation-based assignment can be differentiated as follows:
- Output attributes of assignment
- Output attributes based on the simulation (Table 155)
- Path list
- Assignment statistics
Unlike in simulation, real volumes are determined when demand is distributed across routes (volume balancing). At the end of the assignment, the volumes are listed in the corresponding attributes of the network objects.Table 157 list the output attributes filled with values during SBA.
|
Object |
Attribute |
Meaning |
|
Links, (main) turns |
Volume PrT [veh](AHPI) Volume-DSeg [veh](AHPI) Volume-TSys [veh](AHPI) |
Volume on network object |
|
Links, (main) turns |
vCur_PrTSys(AP) vCur-PrTSys-TI(AP, TI) |
calculated from SBA length and tCur-PrTSys-TI(AHPI) |
|
Links, (main) turns |
t0-PrTSys |
Travel time in network without volume, taking SBA length and FIFO t0 functions into account |
|
Links, (main) turns |
tCur-PrTSys(AP) tCur-PrTSys-TI(AP, TI) |
Travel times calculated from the FIFO tCur functions that are intersected to the analysis time intervals, weighted by the number of vehicles that have contributed to the measured values. |
|
Links, (main) turns |
Impedance-PrTSys(AHPI) |
calculated taking travel time TCur_PrTSys(AHPI) into account |
|
Links, (main) turns |
Delay-PrTSys-TI(AP, TI) |
calculated from t0-PrTSys and travel time tCur-PrTSys |
|
(Main) turns |
Delay on from-link and turn-PrTSys(AHPI) |
link travel time per To turn, intersected to analysis time intervals and weighted by the number of vehicles that contributed to the measured values, plus travel time on turn |
Table 157: Output attributes after assignment
Paths and assignment statistics contain the usual output data per demand segment (paths) or transport system (assignment statistics) that is additionally listed per time interval. Time-interval dependent data output refers to vehicles that have entered the network object during the respective time interval. Path travel times are calculated from the FIFO tCur functions, with FIFO tCur taken into account at the time the vehicles enter the network object. Assignment statistics include default outputs as well as evaluations based on the simulation.
