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This program covers highways on new locations and the alteration of existing highways that significantly change the horizontal or vertical alignment or increases the number of through-traffic lanes. Federal regulations require the Maryland Department of Transportation State Highway Administration (MDOT SHA) evaluate highway traffic noise impacts and consider abatement where reasonable and feasible. MDOT SHA performs a
traffic noise analysis when planning a noise-sensitive land use (near residences, schools, houses of worship, and historic sites). Noise levels are projected for the design year and twenty years into the future utilizing the latest approved FHWA noise prediction model. MDOT SHA furnishes the results of highway traffic noise analysis to local government officials and encourages communities and developers to practice noise-compatible development.
The proposed project will widen an existing four-lane freeway to eight lanes. Ten single-family homes are located in a residential neighborhood in the vicinity of the proposed project. The existing noise level in the area is 66 dBA. A future "build" noise level of 72 dBA and a future "no-build" noise level of 68 dBA are predicted for the design year. A sound barrier approximately 1,385 feet in length and 18 feet in height is required to significantly reduce the noise level.
The proposed project is a two-lane highway. Twelve single-family homes are located in a residential area near the proposed project. The existing noise level in the area is 50 dBA. A future build noise level of 58 dBA and a future no-build noise level of 50 dBA are predicted for the design year.
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