The Utah Department of Transportation (UDOT) created an official Noise Abatement Policy to establish policy and procedure for the Department in regard to noise abatement studies, implementing measures, and coordination with local municipalities and the public to guarantee that all feasible and reasonable mitigation measures are incorporated into projects to minimize noise impacts and protect the public health and welfare.
For your convenience, we have simplified the policy and highlighted most of the material that relates to the US-89 State Environmental Study.
UDOT’s noise abatement policy allows for an objective categorization of projects based on predetermined parameters:
There are 3 different types of projects a construction design could fall under. The US-89 State Environmental Study falls under the Type 1 category, which means that noise abatement will be considered due to the fact that it involves a substantial horizontal alteration to an existing highway.
Noise impact and abatement analyses includes lands within Land Use Activity Categories A, B, C, D and E only when development exists or has been “permitted.”
The traffic noise analysis will include the following:
The Department considers a traffic noise impact to occur when either of the following situations is expected at a sensitive land use:
Refer here for the Sound Level Change vs. Relative Loudness table (Table 2)
The two relevant criteria to consider when identifying and evaluating noise abatement measures for mitigation are feasibility and reasonableness.
The following abatement measures may be considered including a cost/benefit analyses to compare alternatives if a noise impact is identified:
There may be circumstances when existing noise barriers must be relocated or replaced due to conflicts with new construction projects, and where the barriers do not meet new specified criteria. Existing barriers will be relocated or replaced in these cases with an “in-kind” barrier so long as the replacement does not meet any of the hazards listed in the full UDOT document.
A third party, such as a local municipality, may ontribute funds to make functional or aesthetic enhancements to a noise abatement feature in instances where noise abatement has already been deemed feasible and reasonable.
The Department will inform local officials of noise compatible planning concepts and an estimate of future noise levels on undeveloped lands or properties within the project limits for Type I Projects.
The Department may construct and maintain noise abatement measures along state highway right-of-way in cases where citizens, adjacent property owners, developers, or local municipalities provide the cost for the noise abatement; and the abatement meets the other feasible and reasonable criteria.
The Department will design, build, and maintain the abatement measure, and the local municipality acting for and on behalf of other groups will pay the Dpeartment for all preliminary engineering, construction and maintenance costs.
Only the current FHWA-approved Traffic Noise Model (TNM) is to be used for any traffic noise analysis unless otherwise agreed upon in advance by the Department and FHWA.