23 CFR 772 requires the use of TNM version 2.5. Identical input into different versions of TNM, especially version 2.5 as compared 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.
Please contact TNMHelp@dot.gov for Technical Support. In the Subject Line please indicate that you are asking for support for TNM 2.5.
The different typefaces used in these Technical Manual Update sheets are as follows:
Bold - is used to indicate additions of text or data to the manual.
Bold Italics - is used to indicate changes to existing text or data in the manual.
Strike Through - is used to indicate deletions of text or data from the manual.
| Title/Description | Date | HTML | |
|---|---|---|---|
| TNM 2.5 Release and Phase-in Memorandum | 2004 | ||
| TNM 2.5 Release Notes | 2004 | ||
| Traffic Noise Model 2.5 | 2004 | ||
| TNM 2.5 User's Guide | 1998 2004 |
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| TNM 2.5 FAQs | 2004 | ||
| TNM 2.5 Technical Manual | 1998 2004 |
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| TNM 2.5 Validation | 2002 2004 |
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| TNM 2.5 STAMINA Example Case | 2004 |
