Traffic Noise Model 3.0 - Technical Manual
This technical manual describes the Federal Highway Administration’s Traffic Noise Model (TNM®) Version 3.0. Chapter 2 describes the process of determining noise emissions and levels at a reference location 15 m (50 ft) from the traffic noise source. This includes: the geometric discretizing of the study in the horizontal plane into elemental triangles, which are the basis for all other computations; the computation of traffic speed based on user inputs and TNM objects; and the determination of noise emissions based on measured levels at 15 m (50 ft), which are then converted to free-field at the same location. Chapter 3 describes how adjustments based on the horizontal geometry are determined. These include adjustments for: traffic volume and speed, and roadway lengths and distance (Ad). User specified adjustment factors are also discussed. Chapters 2 and 3 combined describe the functions that depend on the horizontal geometry. Chapter 4 describes how adjustments for all shielding and ground effects between the roadway and the receiver (As) are determined. Chapter 5 covers additional adjustment factors for parallel and single barrier reflections. Chapter 6 covers the computation of contours. Appendices supplement the discussions as needed andare largely reproductions of the appendices found in the TNM® Version 1.0, modified only to reflect changes between TNM 1.0 and TNM 3.0 and to avoid repetition of some materials already presented in the main body.
- Record URL:
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Supplemental Notes:
- Funding Number HW17A100 SH040
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Corporate Authors:
John A Volpe National Transportation Systems Center
,Federal Highway Administration
1200 New Jersey Avenue, SE
Washington, DC United States 20590 -
Authors:
- Hastings, Aaron L
- Publication Date: 2019-12
Language
- English
Media Info
- Media Type: Web
- Edition: Final Report
- Features: Appendices; Figures; Tables;
- Pagination: 149p
Subject/Index Terms
- TRT Terms: Acoustics; Geographic information systems; Manuals; Noise sources; Traffic noise
- Identifier Terms: Traffic Noise Model; U.S. Federal Highway Administration
- Subject Areas: Data and Information Technology; Environment; Highways;
Filing Info
- Accession Number: 01737972
- Record Type: Publication
- Report/Paper Numbers: FHWA-HEP-20-012
- Contract Numbers: HW17A1
- Files: NTL, TRIS, ATRI, USDOT
- Created Date: Apr 27 2020 9:09AM