Is TNM version 2.5 compatible with previous versions?
23 CFR 772.17 requires the use of FHWA TNM version 2.5 or any other model determined by the FHWA to be consistent with the methodology of the FHWA TNM version 2.5. There have been several versions of the FHWA TNM that have been superseded by version 2.5. However, the changes in the versions have resulted in minor changes in how the user would use the model, especially from versions 1.1 to 2.1. The use of the model should not be confused with the results of the model. Identical input into different versions of the FHWA TNM, especially version 2.5 to earlier versions, would result in some differences in calculated sound level results. This is due to some changes to the algorithms in version 2.5 and not how the user would use the model. Information on the differences between the versions can be found on the Release Notes, User’s Guide Addendum and/or Validation Studies listed on the webpages for the individual versions of the FHWA TNM.
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