Incorporating Assumptions for TDM Impacts in a Regional Travel Demand Model.

摘要

Faced with substantial funding shortfalls in meeting transportation needs, one of Washington State Department of Transportations key strategies for preserving mobility is improving the efficient operation of the existing transportation facilities by increasing the use of transportation demand management (TDM) strategies to decrease drive alone rates. This requires an ability to forecast the magnitude and geographic distribution of changes in travel patterns likely to result from more aggressive TDM programs. It also requires an ability to estimate the effect these changes will have on delay, speed, and travel time throughout affected corridors. This project developed a Transportation Demand Management Assessment Procedure (TDMAP), as a sketch planning modeling approach to incorporate TDM into WSDOT's travel demand model. TDMAP does so by (1) extracting mode split tables from the model; (2) processing them to be compatible with TRIMMS(Copyright) 2.0, an existing tool that estimates changes in travel behavior as a result of implementing different TDM strategies; (3) running the tables through TRIMMS(copyright) 2.0; and then (4) processing them back into the four-step model for distribution over the transportation network. The study did develop a low cost method to help WSDOT plan TDM strategies as part of its overall transportation planning process.