Transit Demand Modeling

TBEST models simulate transit ridership at the level of the individual stop, clearly distinguishing among stops at the same location, by route and direction.  Thus, it is a “micro-level” model that can provide very detailed information regarding ridership estimates at individual stops.  However, TBEST’s primary role is envisioned to be obtaining more aggregate route level, segment level, location-based, or system level measures of transit ridership through the aggregation of stop-level outputs.  By simulating ridership at the level of the individual stop, the model provides a strong platform and robust framework for modeling transit ridership in a region by time of day and day of week.

The TBEST modeling environment contains the following features:

  • Model Validation – TBEST contains a model validation tools set which allows users to fit TBEST model predictions to the local transit system.  This model transferability allows Florida Department of Transportation the ability to calibrate a single model for implementation at any Florida public transit agency.
  • TBEST Land Use Model – The new TBEST Land Use model integrates parcel-level land use data into the TBEST model stream.  The model utilizes the parcel data’s precise geographic distribution for walk market access which is vital to ridership estimation.  Activity levels are measured by generating person trips at the parcel level.  Trip generation is based on ITE derived trip rates formulated within an editable spreadsheet.  Users can customize the trip rates based on observed local trip making patterns.
  • Multiple Model Management – Within TBEST 4.2, users are able to maintain multiple model structures which can be applied to model scenarios.  TBEST 4.2 is installed with the new TBEST Land Use Model 2015 which includes trip-generation from parcel land use data.
  • Editable Model Structures – Model Structures are editable within TBEST including adding, deleting or modifying coefficients, modifying land use trip rates, modifying network and market accessibility parameters including maximum impedance, number of transfers, walk market distance and many more.  The linear equation is also editable inside of the Microsoft Visual Basic Express scripting environment.  Users who wish to edit the model structure should do so only in support of a model calibration effort.
  • BRT Sensitivity – TBEST now supports BRT route definition and model sensitivity.  Users specify the implementation level of specific route-level BRT characteristics and TBEST will adjust base ridership forecasts with an empirically derived adjustment factor.