Regulations, Guidelines, & Policies

CDOT Noise Analysis & Abatement Guidelines

CDOT’s Noise Analysis and Abatement Guidelines was most recently published on October 9, 2020. As a result, the CDOT Traffic Noise Technical Report Template and associated Form 1209 were also updated. 

CDOT's 2020 Noise Analysis and Abatement Guidelines

• September 2020, Version 6

CDOT's Traffic Noise Technical Report Template

• July 2024, Version 3 - for projects using 2020 NAAG

Form 1209: Noise Abatement Evaluation Worksheet, September 2020 Version for projects using 2020 NAAG. (CDOT is in the process of remediating this document to meet accessibility requirements. In the interim, a non-remediated version is available upon request.)

Other Resources

• Federal Noise Regulation 23 CFR 772
• CDOT Roadway Design Guide, Chapter 16 - Noise
• FHWA's Highway Traffic Noise: Analysis and Abatement Guidance, December 2011
• Colorado Revised Statutes Title 25 Health Section 25-12-103, Maximum permissible noise levels
• FHWA's highway traffic noise website