How Weather Affects the Noise You Hear from Highways (2018) / Chapter Skim
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Pages 74-77
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From page 74... ...
74 Factors for developing guidance on considering meteorological effects in highway traffic noise studies include the state of the practice in other countries, availability of models for evaluating meteorological effects, ease of obtaining the required model data, variations in meteorological conditions, effects on noise impact and noise abatement conclusions, and the extent to which considering meteorological effects could affect the decision-making process. State of the Practice in Other Countries The literature review report conducted as part of this research project (Appendix A)
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From page 75... ...
Guidance and Implementation 75 The EU decided in 2015 that future traffic noise mapping calculations will be performed with a harmonized noise model called CNOSSOS-EU. The EU considered three models for the propagation part of CNOSSOS-EU: • ISO 9613-2, • The French NMPB traffic noise model, and • Harmonoise.
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From page 76... ...
76 How Weather Affects the Noise You Hear from Highways increases the number of benefited residences. As a result, the barriers designed under neutral conditions to meet the requirements of the FHWA noise regulation and SHA noise policy would still be feasible and reasonable under downwind and inversion conditions.
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From page 77... ...
Guidance and Implementation 77 As a result, the most typical actual worst noise hour condition could occur during either the morning or afternoon peak hour, depending on whether nighttime inversions have set in or at other times that are affected by downwind conditions. There may need to be additional analysis of the combinations of traffic, speed, and meteorological conditions to accurately identify the worst noise hour for a project.
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