P+R is a special case of multimodel applications. Exactly two paths are covered: For the outward journey, first PrT then PuT is used. The mode is changed in the zone that represents the P+R parking lot. For the return journey, the modes are used in the reverse order.
The procedure P+R lot choice calculates the distribution of P+R demand across the existing parking lots. The results of this calculation are saved in path sequences, separated by demand stratum and and direction. The path sequences can be analyzed and displayed in the network. The demand stratum of the corresponding path sequence sets is derived from the demand model.
In addition, during the procedure P+R lot choice, path legs can be assigned to demand segments that are required for calculating skims for path sequences.
The P+R utility matrices of the P+R lot choice include the utilization rate dependent utility of the P+R parking lot. If you want to calculate skims or utilities for the return journey of a P+R path, but do not wish to include the parking lot utilization rate, use the procedure Calculate skim matrix from path sequences.
This approach is based on the assumption that the P+R lot choice is determined by the utility of the outward journey. For the return journey, however, it is assumed that only the utility of the path legs are important. The procedure Calculate skim matrix from path sequences allows you to calculate skims without having to recalculate demand distribution across the P+R parking lots.
The procedure P+R leg split generates two demand matrices based on path sequences of a path sequence set - one for the inbound and one for the outbound path leg. The calculation performed is similar to the calculation in the procedure Calculate demand from path sequences. The difference is that you can explicitly specify the result matrices in the procedure and the occupancy rate of the demand segment is not taken into account.
