AAMPO TDM Forecasted Congestion

The Alamo Area Metropolitan Planning Organization develops and maintains a full set of Travel Demand Models (TDM) 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 4.0 (SAMM4.0 runs in TransCAD 6.0) is currently being updated for better suitability in analyzing the air quality implications for various roadway and transit projects. SAMM4.0 will be used for evaluating alternative demographic scenarios as well as alternative highway and transit systems as part of the Metropolitan Transportation Plan (MTP) update that will be adopted by our Transportation Policy Board in 2019. 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). The SAMM 4.0 models now provide time-of-day forecasts for 4 daily time periods, including AM-Peak, Midday, PM-Peak & Overnight. Our Travel Demand 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: Analysis of Transportation Systems for Short and Long Range Planning Evaluation of Regional Transportation System Improvements Identification of Transportation System Deficiencies Conduct Alternatives Analyses, Corridor Studies or Subarea Studies Perform Mobile Source Area Toxics (MSAT) Analyses Interface with US EPA Emissions Software (Moves) to Estimate On-road Mobile Source Emissions for Urban Airshed Modeling and AQ Conformity Analyses