How Much Sound Will the Barrier Extension Keep Out?

The aim of an extension of a noise barrier in Elkridge is to reduce noise levels by at least half for about 18 homes, according to the State Highway Administration. 

Although a 7-decibel noise reduction is the minimum, the project aims for a 10-decibel reduction “where it is practical,” according to Heather Keels, Community Liaison for the SHA.

A 5 to 7-decibel reduction is “readily noticeable,” she said, while a 10-decibel reduction is “essentially perceived as being ‘cut in half.’”

The overall aim of the 2,000-foot extension, (along Interstate 95, one mile north of MD 100 to Montgomery Road) is to reduce noise levels in the area to less than 66 decibels, Keels said.

That’s a reduction of 7 to 9 decibels for homes farther from Interstate 95, and a reduction of up to 15 decibels for the homes closest to the interstate. 

If the weather permits, the extension should be complete by September.

Related:

- SHA Extending Sound Barrier in Elkridge

- SHA: No Construction Money for Elkridge Sound Barrier