Highway Noise

Mission

In regards to all federal highway projects in the District of Columbia, DDOT should consider noise mitigation whenever a project-related highway traffic noise impact is expected to occur. A highway traffic noise impact is deemed to occur when predicted (design-year) noise levels either approach or exceed the applicable noise abatement criteria (NAC) or substantially increase the existing noise levels.

DDOT Noise Policy

Open

Procedures & Services

DDOT shall follow the following steps for evaluating traffic-related noise impacts:

1. Identify Existing Activities

2. Measure Existing Noise Levels

3. Predict Future Noise Levels

4. Identify Potential Impacts

5. Evaulate Appropriate Abatement Measures

• DDOT Highway Noise Policy § 6.2

See Related

Additional Information

Legal References

• 23 CFR 772: Process for Abatement of Highway Noise and Construction Noise

• Noise Control Amendment Act of 1977

• DCMR 20-27: Noise Control

• DCMR 20-28: Maximum Noise Levels

• DCMR 20-29: Noise Measure Test Procedures

Design Standards & Specifications

• n/a

Transportation Plans & Studies

• n/a

Other Resources

• DC Dept. of Consumer and Regulatory Affairs (DCRA): Noise Regulation Handbook