Negative Effects of Sound
* Lowers the quality of life
* Can impact outside conversation
* May deter some development
* Some studies show harmful health effects
Who's Responsible?
* Federal Highway Administration Sets National Guidelines
* States Implement Federal and State Guidelines
* Local Governments Enact Land Use Policies
Noise Assessments
- Required as part of NEPA Process
- Determine whether there are sensitive receivers
- Computer modeling
- Review of land use plans
- Aerial photography
Federal Participation
- Federal funding for Type II projects approved:
- For projects approved before 11/28/95
- Along lands where development predated any highway
- For areas not previously rejected for a barrier in a Type I project
FHWA Approach to Roadway Noise
- 3-Part Approach to Traffic Noise Control
- Source Control
- Reduction Measures in Highway Construction
- Noise Compatible Land Use Planning
Source Control: Noise Sources for Heavy Trucks
Measuring Sound
- Decibels
- Are a logarithmic scale
- Are based on values of 10
- Sound measurement is weighted to what the human ear can hear (A-weighted)
- Descriptor will be the hourly equivalent sound level (LAeq1h)
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