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. These changes are summarized in an update summary document that includes information on applicability of the 2020 vs. 2015 NAAG. These documents are provided in the following bullet list. During the transition, noise analyses that are still required to use the 2015 NAAG will also use the 2018 template and 2015 form. Therefore, they are also provided.

• 2020 Noise Analysis and Abatement Guidelines
• 2015 Noise Analysis and Abatement Guidelines

CDOT's Traffic Noise Technical Report Template

• April 2018, Version 1 - for projects using 2015 NAAG
• September 2020, Version 2 - for projects using 2020 NAAG

Form 1209: Noise Abatement Evaluation Worksheet

• February 2015 Version - for project using 2015 NAAG
• September 2020 Version - for projects using 2020 NAAG
• CDOT 2020 NAAG Update Summary

Other Resources

• Federal Noise Regulation 23 CFR 772
• CDOT Roadside Design Manual, Chapter 18 - Noise
• FHWA's Highway Traffic Noise: Analysis and Abatement Guidance, December 2011
• FHWA's Measurement of Highway-Related Noise, May 1996
• Colorado Revised Statutes Title 25 Health Section 25-12-103, Maximum permissible noise levels
• FHWA's highway traffic noise website