Travel Demand Model - OKI

Table of Contents1. Introduction................................................................................................................................. 11.1 Overview of Truck Model Development and Structure.......................................................... 12. Base-Year Truck Model Development ............................................................................................. 42.1 Database Development..................................................................................................... 42.1.1 Freight analysis zones................................................................................................... 62.1.2 Truck network development .......................................................................................... 62.1.3 Vehicle classification ..................................................................................................... 82.1.4 Truck counts.............................................................................................................. 102.2 External Trips ................................................................................................................ 122.3 Seed Matrix Development ............................................................................................... 142.3.1 Truck trip generation .................................................................................................. 142.3.2 Truck trip distribution ................................................................................................. 162.4 Synthetic Matrix Estimation ............................................................................................. 202.4.1 Description of single-path matrix estimation algorithm................................................... 202.4.2 Multi-stage implementation of synthetic matrix estimation ............................................. 232.5 Post-Processing.............................................................................................................. 242.5.1 Conversion to TAZ–to-TAZ flows.................................................................................. 252.5.2 Distribution to daily time periods ................................................................................. 263. Base-Year Truck Model Results.................................................................................................... 293.1 Truck County-to-County Movements ................................................................................ 293.2 Truck Trip End Summaries .............................................................................................. 323.3 Truck Percentages of Assigned Volume ............................................................................ 393.4 Truck Trip-Length Profiles ............................................................................................... 393.5 Validation to Truck Count Data ........................................................................................ 424. Truck Trip Table Forecasting Procedures ......................................................................................454.1 Description .................................................................................................................... 454.1.1 Forecast zonal employment by industry type................................................................. 464.1.2 Develop industry-specific productivity deflation factors .................................................. 474.1.3 Calculate growth factors and forecast total zonal trip ends............................................. 494.1.4 Apply two-dimensional matrix balancing ....................................................................... 504.1.5 Allocate the forecast daily truck trips to analysis time periods......................................... 504.2 Summary of Forecast Results .......................................................................................... 50ii