Alamo Area Metropolitan Planning Organization
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Travel Demand Modeling (TDM)


The Alamo Area Metropolitan Planning Organization develops and maintains a full set of Travel Demand Models for our region, covering all of five counties, including Bexar, Comal, Guadalupe, Kendall and Wilson. The current TDM, known as San Antonio Multi-modal Model, version 3.0 (SAMM3.0 runs in TransCAD 6.0) was last updated in 2014 and was recently used for evaluating alternative demographic scenarios as well as alternative highway and transit systems as part of the Metropolitan Transportation Plan (MTP) update that was adopted by our Transportation Policy Board in December, 2014.

AAMPO’s TDM is a traditional 4-step model including Trip Generation (Tripcal5), Trip Distribution (Destination Choice), Mode Choice (Nested Logit) and Traffic Assignment (TransCAD MMMC User Equilibrium). These models provide the primary means for identifying existing and future transportation system deficiencies and for assessing proposed regional mobility improvements. The models are suitable for the following applications:

The current SAMM3.0 TDM has been calibrated and validated to travel data (including traffic count and transit ridership) for the year 2010. However, much of the travel parameter data is based upon regional travel surveys, last conducted during 2005-2006. Moreover, the current Base Year Models are for 2010, with a Short Range Forecast for 2020 and a Long Range MTP Forecast for 2040. Complete (or partial) sets of TDM downloads are available for each of these three analysis years including TAZ-level demographics, highway & transit networks, time & distance skims, trip matrices and a variety of model output summaries.

Please select a category of interest to you:

Download Modeling Data buttonDownload documentation button

If you have any questions or comments, please contact:

Zachary Graham

Senior Transportation Modeler
Travel Demand Modeling Supervisor

(210) 230-6907