United States Department of Transportation
[PDF-4.71 MB]
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Alternative Title:Technical Manual: Traffic Noise Model 3.0
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Edition:Final report
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Abstract: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 and are 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.
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