Traffic Noise Model 3.1 - Technical Manual

Details

• Creators:
  Hastings, Aaron L.
• Corporate Creators:
  John A. Volpe National Transportation Systems Center (U.S.)
• Contributors:
  Ho, Cecilia
• Corporate Contributors:
  United States. Department of Transportation. Federal Highway Administration
• Subject/TRT Terms:
  • Traffic noise
  • Validation
  • Computer models
  • Acoustic emission tests
• Publication/ Report Number:
  FHWA-HEP-21-041
• Resource Type:
  Tech Report
• Geographical Coverage:
  United States
• Edition:
  Final Report
• Contracting Officer:
  Ho, Cecilia
• Corporate Publisher:
  United States. Department of Transportation. Federal Highway Administration
• Abstract:
  This technical manual describes the Federal Highway Administration’s Traffic Noise Model (TNM) Version 3.1. 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 3.1 and to avoid repetition of some materials already presented in the main body.
• Format:
  PDF
• Funding:
  HW58F119 UJ930
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/80951/dot_80951_DS1.pdf
• File Type:
  [PDF - 2.66 MB]
• Collection(s):
  Volpe Center ; Federal Highway Administration
• Main Document Checksum:
  urn:sha-512:3193152ec4b4f7752f4afdc01f7a1fe69623fcac57ac27459d3696426486996620685f54ab55eab1057a9baeb57a47d5a112ed6b42ada4c9d3bb6a3a2ecebefe