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Long Range Planning Division - Travel Modeling

Regional Planning Office
James K. Polk Building, Suite 900
505 Deaderick Street
Nashville, Tennessee 37243-0344
Bob Rock, Transportation Specialist
Phone: 615.741.3695
Fax: 615.532.8451

Travel Demand Modeling

Travel Demand Models (TDMs) are used to forecast traffic flows on the transportation system. Although the transportation system may include other modes of travel such as walking and biking, the models are typically used for evaluating roadway improvements or improvements to bus service. 

The eleven Metropolitan Planning Organizations (MPOs) in Tennessee have TDMs that have been developed for use in their long range plan development and in some areas for air quality conformity. The Regional Planning Office is responsible for certifying that all MPO models meet the standards in the “Minimum Travel Demand Model Calibration and Validation Guidelines for Tennessee” and the “TDOT Model Approval Procedures”.

A statewide travel demand model has been developed by the Regional Planning Office.  This model includes many of the functionally classified highways in Tennessee, and connects to major highways outside of Tennessee.  For more information on this model, please contact Bob Rock .

Tennessee Model User’s Group (TNMUG):  The Regional Planning Office sponsors a model users group for travel demand modelers in Tennessee. The group meets quarterly and includes representatives from TDOT, the MPOs, the consulting industry and academia.  The University of Tennessee Transportation Center provides administrative support for the group. More information on the TNMUG can be found at