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OCR for page 34
DEVELOPMENT OF NEW YORK TOUR-BASED MODEL 23
1 no stops on ether outbound or inbound direction; mode, and destination area. One of the ongoing works
2 one outbound stop leg, no inbound stops; of PB Consult for further enhancement of the NYMTC
3 no outbound stops, one inbound stop; and model includes replacement of the time-of-day distribu-
4 one stop in each direction. tion with a time-of-day choice model sensitive to person,
household, and level-of-service variables. Time-of-day
The proposed stop location choice model is also a choice is followed by trip mode choice (in most cases
multinomial logit construct. Similar to the destination- predetermined by the entire-tour mode) and a preassign-
choice model, the stop-location model requires a proce- ment processing procedure that constructs mode-specific
dure for selecting a limited subset of relevant zones (for and period-specific trip tables.
both model calibration and application) to reduce com- In the period from 2002 to 2006, the New York
putational burden. In the case of the stop-location model had been used by NYMTC for more than 30 local
model, however, both origin and destination of the jour- planning agencies for various projects, including envi-
ney are known; thus, effective rules were applied to build ronmental conformity analysis, a Tappan Zee bridge
a "spatial envelope" that reflects the observed traveler's study, a Goethals bridge study, a Manhattan, New York,
behavior. area pricing study, and many others. Since 2002, PB
The current version of the NYMTC model has a time- Consult has been constantly supporting NYMTC and
of-day choice model based on a set of predetermined the other users through an ongoing model support con-
time-of-day distributions segmented by travel purpose, tract with NYMTC.
