Embedded Dataset Excel:

Dataset Excel:

Notes:

Miles of noise barriers can neither be assigned a year of construction or a cost.

Miles of barriers, while assigned a year of construction, cannot be assigned a cost.

Description:

KEY: R = revised.

^a  A Type I barrier is built on a new highway project or a physically altered existing highway.

^b  A Type II barrier is built to abate noise along an existing highway (often referred to as retrofit abatement) and is not mandatory.

^c All other types of barriers are nonfederally funded.

^d Have not been assigned a year of construction or a cost.

Source:

U.S. Department of Transportation, Federal Highway Administration, Office of Planning, Environment, and Realty, Summary of Noise Barriers Constructed by December 31, 2019 (Washington, DC: June 2021), available at http://www.fhwa.dot.gov/environment/noise/noise_barriers/inventory/ as of Oct. 13, 2021.