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OKI Travel Demand Model OKI Travel Demand Model estimates transportation system performance. As of August 2006, the current model is version 6.3. The OKI Travel Demand Model is utilized as a key tool in many of OKI’s work elements, including corridor studies, air quality analysis and long-range transportation planning. The model composed of TRANPLAN programs and a series of FORTRAN programs written by OKI. It is a state of the practice model that uses the standard 4 phase sequential modeling approach of trip generation, distribution, modal choice and assignment. The model uses demographic and land use data and capacity and free-flow speed characteristics for each roadway segment in the network to produce a “loaded” highway network with forecasted traffic volumes with revised speeds based on specified speed/capacity relationships. Travel analysis zones are the basic geographic unit for estimating travel in the OKI model. The OKI region is subdivided into 1608 traffic analysis zones to permit detail as well as manageability. A variety of socioeconomic data items are used in the OKI transportation planning process. These data are used primarily to forecast future travel patterns by serving as independent variables in OKI trip generation equations. The following categories of planning data are utilized:
The principal data requirements of the OKI travel demand forecasting model are population and employment. From these variables, other characteristics including households, labor force, and personal vehicles may be derived. Chapter 5 of OKI 2030 Regional Transportation Plan 2004 Update provides a complete demographic overview of the region. OKI utilizes both base year (2000) and future year data (2010, 2020 and 2030) in the planning process. Base year planning data are maintained at the Traffic Analysis Zone (TAZ) level, and originate in the 2000 Census of Population and Housing. Future year data for each variable were projected through various methods. More detailed explanation of base year and future year data generation for each of the above-mentioned categories of planning data follows. All of the variables represent the latest OKI planning assumptions. Links
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