The P+R lot choice procedure calculates optimum P+R lots, their volume as well as the utility matrices which contain the utility that derives from it (Fundamentals: Park + Ride lot choice).
1. On the toolbar, click the 
Open 'Procedure sequence' window button.
The Procedure sequence window opens.
2. To the procedure sequence, at the position of your choice, add the procedure P+R lot choice of the Multimodal category (Setting up and starting the procedure sequence).
3. In the row of the inserted procedure, click the button in the Reference object(s) column.
The Demand strata selection window opens.
4. In the Select demand model list, click the demand model the demand strata belong to.
5. In the Demand stratum selection list, select the demand strata for which you want to calculate the P+R lot choice.
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Tip: To select multiple demand strata, hold down the Ctrl key while clicking the desired entries one by one. |
6. Confirm with OK.
The demand strata selected are listed in the Reference object(s) column.
7. Make sure the added procedure is highlighted. Then, in the Operations section, click the Edit button.
The window P+R lot choice - Procedure parameters opens.
8. Make the desired settings for all demand strata.
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Element |
Description |
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Mode |
Here you select the mode of your choice, e.g. P+R. |
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P+R capacity attribute |
Here you may select a numeric zone attribute for the P+R capacity. Note For this purpose, e.g. first design a user-defined attribute. |
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Volume-delay function attribute |
Here you may select an integer zone attribute that specifies the number of the desired P+R volume-delay function. Notes From the Calculate menu, choose > General procedure settings > PrT settings > P+R volume-delay function to add volume-delay functions specifically for the procedure P+R lot choice (Definition and application of volume-delay functions). For all volume-delay functions applies t0 = 1 when calculating the P+R lot choice. |
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Maximum gap |
Measure of the deviation in the iteration Note The procedure is finished when either the maximum number of iterations has been reached or the gap value goes below the defined threshold. |
| Maximum number of iterations | Here you can specify the maximum number of iterations. |
9. Make the following settings per demand stratum.
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Element |
Description |
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Demand stratum code |
Codes of the selected demand strata |
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Demand matrix |
Here you enter the demand matrix of your choice that specifies the P+R demand per origin-destination. Note Number and name of matrix are then shown in the adjacent column. |
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Utility function (incoming) |
Click the button to define a combination of matrices and attribute vectors that is used as a utility matrix for lot choice calculation and for specification of the utility function leading to the P+R lot. Note Note that it is the utility and not the impedance that is defined at this point. The difference is mainly in the sign: while impedance typically has a positive sign (e.g. travel time), utility usually has a negative sign. |
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Utility function (outgoing) |
Click the button to define a combination of matrices and attribute vectors that is used as a utility matrix for lot choice calculation and for specification of the utility function leading out of P+R lot. Note Note that it is the utility and not the impedance that is defined at this point. The difference is mainly in the sign: while impedance typically has a positive sign (e.g. travel time), utility usually has a negative sign. |
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Utility matrix |
Select the utility matrix that will include the results after calculation. Number and name of matrix are then shown in the adjacent column. Note Note that the matrix is a utility matrix and not an impedance matrix. Consequently, it typically enters the P+R mode utility function without a negative weighting parameter in the mode choice model. |
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Lot saturation weight |
Factor for the saturation-dependent impedance that results from the P+R usage. The utility parameter must be negative, since it transforms the vol/cap impedance into the corresponding utility. Default: -1 |
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Output to path sequence set no |
For the output of the results, you can either select an existing path sequence set from the drop-down list, or create a new path sequence set for the marked demand stratum by clicking the button Generate output path sequence sets > entry For the outward direction of marked demand strata. The paths of the P+R lot choice are saved to this path sequence set. |
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Demand segment code (incoming) |
Optionally, in the list box, click a demand segment code for the inbound path sequence items of the P+R zone. If a demand segment code is selected, the corresponding demand segment is assigned to the first and second path sequence items. |
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Demand segment code (outgoing) |
Optionally, in the list box, click a demand segment code for the outbound path sequence items of the P+R zone. If a demand segment code is selected, the corresponding demand segment is assigned to the first and second path sequence items. |
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Reverse output to path sequence set no |
For the output of the results, you can either select an existing path sequence set from the drop-down list, or create a new path sequence set for the marked demand stratum by clicking the button Generate output path sequence sets > entry For the reverse direction of marked demand strata. The paths of the P+R lot choice are saved to this path sequence set. |
10. Confirm with OK.
11. Execute the procedure (Executing procedures in the procedure sequence).
For each selected demand stratum, a P+R utility matrix and the optimal P+R lots and their capacities are calculated. You can show the results in the zones or OD pairs list, when you select the calculated attributes P+R capacity and P+R lot capacity. Contrary to other skims, the P+R utility matrix expresses the utility that is generated by P+R. If you have selected an output to path sequence set number, you can also view the results in the lists Path sequences and Path sequence sets. If the path sequence sets of both directions are empty, only the utility matrix is generated.
