Noise Barriers - Noise Analysis

Noise Barriers - Noise Analysis

Noise barriers

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Note: this video was produced for MnDOT's Noise Policy, and some provisions may not apply to all future road construction or noise wall projects. For updated requirements, please refer to MnDOT's new Noise Requirements page.

When does MnDOT conduct noise studies?

Noise analysis is activated in two primary instances:

• The first instance occurs during a major reconstruction project involving road expansion with additional lanes extending over a mile or significant alignment changes. Such projects typically necessitate a comprehensive environmental review where noise and noise barriers are among the factors assessed.
• The second instance, known as a retro-fit project, addresses standalone noise walls where a major reconstruction is not imminent. In this program, sites are prioritized based on current noise levels, barrier length, and the number of affected homes. You can view a copy of the ranking results.

How does MnDOT determine the feasibility of noise barrier construction?

For a noise barrier to be constructed alongside a highway project, it must be both feasible and deemed reasonable. This assessment considers various factors such as cost, the potential noise reduction, safety aspects, and site characteristics. Decisions regarding noise mitigation locations are made on a case-by-case basis.

Mechanism of noise barriers

Noise barriers function by obstructing the direct transmission of sound waves from highways to nearby homes and businesses. While they do not eliminate noise entirely, they can mitigate it. To be recognized as effective, a noise barrier must achieve at least a 5-decibel reduction in impact on adjacent receptors.

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Does noise intensify as it crosses over the barrier?

No, noise does not amplify as it traverses the barrier. In fact, the farther noise travels, the more it diminishes.

Is it feasible to plant trees to obstruct traffic noise?

Insufficient space exists to plant the necessary quantity and size of trees to effectively mitigate traffic noise. For significant noise reduction, at least 100 feet of dense evergreen trees that are 15 feet tall or more are required. Moreover, trees intended for noise reduction necessitate maintenance, which MnDOT is not equipped to provide.

Impact of noise barriers on property values

No studies have conclusively linked property values to the presence of noise barriers. Prospective buyers might either value the noise reduction benefits or express aesthetic concerns regarding the barriers.

Read more FAQs regarding noise.

Effectiveness of noise barriers along interstate highways