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From page 45... ... 45 C H A P T E R 6 6.1 Introduction Based upon the extensive FHWA TNM modeling experience of research team members and the review of data obtained from the literature search, a number of candidate modeling techniques for multilane highways have been identified. Typical issues encountered in FHWA TNM modeling of roadway sections that contain more than one travel lane in each direction include the following: • Modeling groups of lanes versus modeling each lane as its own roadway. Read the entire page →
From page 46... ... 46 microphone heights at the 95-ft and 246-ft locations were positioned at 5 ft above the ground. • Volpe Site 01MA. Read the entire page →
From page 47... ... 47 6.3.1.3 Adjacent Lane Width Technique This technique involves defining a shoulder in FHWA TNM by establishing the outside of the shoulder by designating an appropriate width for its adjacent roadway lane. This width can also be used to define the outside diffraction edge of the roadway section. Read the entire page →
From page 48... ... 48 modeling is more precise because the noise sources are more precisely located, this result illustrates the importance of modeling individual lanes in areas where certain lanes may be shielded and others may be exposed, or where certain vehicles in certain lanes are shielded and some are not. While this situation most often exists in locations close to and/or below the grade of the highway, it could also exist at other locations that may be shielded or partially shielded by features that are either manmade (structures, barriers, etc.) Read the entire page →

From page 45...

... 45 C H A P T E R 6 6.1 Introduction Based upon the extensive FHWA TNM modeling experience of research team members and the review of data obtained from the literature search, a number of candidate modeling techniques for multilane highways have been identified. Typical issues encountered in FHWA TNM modeling of roadway sections that contain more than one travel lane in each direction include the following: • Modeling groups of lanes versus modeling each lane as its own roadway.

Read the entire page →

From page 46...

... 46 microphone heights at the 95-ft and 246-ft locations were positioned at 5 ft above the ground. • Volpe Site 01MA.

Read the entire page →

From page 47...

... 47 6.3.1.3 Adjacent Lane Width Technique This technique involves defining a shoulder in FHWA TNM by establishing the outside of the shoulder by designating an appropriate width for its adjacent roadway lane. This width can also be used to define the outside diffraction edge of the roadway section.

Read the entire page →

From page 48...

... 48 modeling is more precise because the noise sources are more precisely located, this result illustrates the importance of modeling individual lanes in areas where certain lanes may be shielded and others may be exposed, or where certain vehicles in certain lanes are shielded and some are not. While this situation most often exists in locations close to and/or below the grade of the highway, it could also exist at other locations that may be shielded or partially shielded by features that are either manmade (structures, barriers, etc.)

Read the entire page →

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