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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.

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


Colorado: The Official State Web Portal